Trouble after upgrading to 2.1 agent

after upgrading to the new 2.1 version and register the agent as described in Monitoring Linux - The new agent for Linux in detail I get the following error: [agent] Host is registered for TLS but not using it

Am I missing something?

CMK version:
2.1
OS version:
ubuntu 20.04
Error message:
[agent] Host is registered for TLS but not using it**CRIT**
Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)

Checkmk version 2.1.0
Try license usage history update.
Trying to acquire lock on /omd/sites/timdebruijn/var/check_mk/license_usage/next_run
Got lock on /omd/sites/timdebruijn/var/check_mk/license_usage/next_run
Trying to acquire lock on /omd/sites/timdebruijn/var/check_mk/license_usage/history.json
Got lock on /omd/sites/timdebruijn/var/check_mk/license_usage/history.json
Next run time has not been reached yet. Abort.
Releasing lock on /omd/sites/timdebruijn/var/check_mk/license_usage/history.json
Released lock on /omd/sites/timdebruijn/var/check_mk/license_usage/history.json
Releasing lock on /omd/sites/timdebruijn/var/check_mk/license_usage/next_run
Released lock on /omd/sites/timdebruijn/var/check_mk/license_usage/next_run
+ FETCHING DATA
  Source: SourceType.HOST/FetcherType.TCP
[cpu_tracking] Start [7f4e226d3fa0]
[TCPFetcher] Fetch with cache settings: DefaultAgentFileCache(rss.timdebruijn.lan, base_path=/omd/sites/timdebruijn/tmp/check_mk/cache, max_age=MaxAge(checking=0, discovery=120, inventory=120), disabled=False, use_outdated=False, simulation=False)
Not using cache (Does not exist)
[TCPFetcher] Execute data source
Connecting via TCP to 192.168.1.15:6556 (5.0s timeout)
Detected transport protocol: TransportProtocol.PLAIN (b'<<')
Closing TCP connection to 192.168.1.15:6556
[cpu_tracking] Stop [7f4e226d3fa0 - Snapshot(process=posix.times_result(user=0.0, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.08999999985098839))]
  Source: SourceType.HOST/FetcherType.PIGGYBACK
[cpu_tracking] Start [7f4e226cd4c0]
[PiggybackFetcher] Fetch with cache settings: NoCache(rss.timdebruijn.lan, base_path=/omd/sites/timdebruijn/tmp/check_mk/data_source_cache/piggyback, max_age=MaxAge(checking=0, discovery=120, inventory=120), disabled=True, use_outdated=False, simulation=False)
Not using cache (Cache usage disabled)
[PiggybackFetcher] Execute data source
Piggyback file '/omd/sites/timdebruijn/tmp/check_mk/piggyback/rss.timdebruijn.lan/vcsa.timdebruijn.nl': Successfully processed from source 'vcsa.timdebruijn.nl'
No piggyback files for '192.168.1.15'. Skip processing.
Not using cache (Cache usage disabled)
[cpu_tracking] Stop [7f4e226cd4c0 - Snapshot(process=posix.times_result(user=0.0, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.0))]
+ PARSE FETCHER RESULTS
  Source: SourceType.HOST/FetcherType.TCP
  -> Not adding sections: Host is registered for TLS but not using it
  Source: SourceType.HOST/FetcherType.PIGGYBACK
<<<esx_vsphere_vm:cached(1653924216,90)>>> / Transition NOOPParser -> HostSectionParser
<<<labels:sep(0)>>> / Transition HostSectionParser -> HostSectionParser
No persisted sections
  -> Add sections: ['esx_vsphere_vm', 'labels']
Received no piggyback data
Received no piggyback data
[cpu_tracking] Start [7f4e226cda90]
value store: synchronizing
Trying to acquire lock on /omd/sites/timdebruijn/tmp/check_mk/counters/rss.timdebruijn.lan
Got lock on /omd/sites/timdebruijn/tmp/check_mk/counters/rss.timdebruijn.lan
value store: loading from disk
Releasing lock on /omd/sites/timdebruijn/tmp/check_mk/counters/rss.timdebruijn.lan
Released lock on /omd/sites/timdebruijn/tmp/check_mk/counters/rss.timdebruijn.lan
CPU load             PEND - Check plugin received no monitoring data
CPU utilization      PEND - Check plugin received no monitoring data
Check_MK Agent       PEND - Check plugin received no monitoring data
Disk IO SUMMARY      PEND - Check plugin received no monitoring data
ESX CPU              demand is 0.147 Ghz, 1 virtual CPUs
ESX Datastores       Stored on nvme1-esxi2 (931.25 GB/91.7% free)
ESX Guest Tools      VMware Tools are installed, but are not managed by VMWare
ESX Heartbeat        Heartbeat status is green
ESX Hostsystem       Running on 192.168.1.32
ESX Memory           Host: 1.03 GB, Guest: 327.00 MB, Ballooned: 0.00 B, Private: 1.00 GB, Shared: 0.00 B
ESX Mounted Devices  HA functionality guaranteed
ESX Name             rss.timdebruijn.lan
ESX Snapshots        Count: 0
Filesystem /         PEND - Check plugin received no monitoring data
Filesystem /boot     PEND - Check plugin received no monitoring data
Interface 2          PEND - Check plugin received no monitoring data
Interface 3          PEND - Check plugin received no monitoring data
Kernel Performance   PEND - Check plugin received no monitoring data
Memory               PEND - Check plugin received no monitoring data
Mount options of /   PEND - Check plugin received no monitoring data
Mount options of /boot PEND - Check plugin received no monitoring data
Number of threads    PEND - Check plugin received no monitoring data
PostgreSQL ANALYZE MAIN/miniflux PEND - Check plugin received no monitoring data
PostgreSQL ANALYZE MAIN/postgres PEND - Check plugin received no monitoring data
PostgreSQL Bloat MAIN/miniflux PEND - Check plugin received no monitoring data
PostgreSQL Bloat MAIN/postgres PEND - Check plugin received no monitoring data
PostgreSQL Connection Time MAIN PEND - Check plugin received no monitoring data
PostgreSQL Connections MAIN/miniflux PEND - Check plugin received no monitoring data
PostgreSQL Connections MAIN/postgres PEND - Check plugin received no monitoring data
PostgreSQL DB MAIN/miniflux Size PEND - Check plugin received no monitoring data
PostgreSQL DB MAIN/miniflux Statistics PEND - Check plugin received no monitoring data
PostgreSQL DB MAIN/postgres Size PEND - Check plugin received no monitoring data
PostgreSQL DB MAIN/postgres Statistics PEND - Check plugin received no monitoring data
PostgreSQL DB MAIN/template1 Size PEND - Check plugin received no monitoring data
PostgreSQL DB MAIN/template1 Statistics PEND - Check plugin received no monitoring data
PostgreSQL Daemon Sessions MAIN PEND - Check plugin received no monitoring data
PostgreSQL Instance MAIN PEND - Check plugin received no monitoring data
PostgreSQL Locks MAIN/miniflux PEND - Check plugin received no monitoring data
PostgreSQL Locks MAIN/postgres PEND - Check plugin received no monitoring data
PostgreSQL Query Duration MAIN/miniflux PEND - Check plugin received no monitoring data
PostgreSQL Query Duration MAIN/postgres PEND - Check plugin received no monitoring data
PostgreSQL VACUUM MAIN/miniflux PEND - Check plugin received no monitoring data
PostgreSQL VACUUM MAIN/postgres PEND - Check plugin received no monitoring data
PostgreSQL Version main PEND - Check plugin received no monitoring data
Systemd Service Summary PEND - Check plugin received no monitoring data
Systemd Timesyncd Time PEND - Check plugin received no monitoring data
TCP Connections      PEND - Check plugin received no monitoring data
Uptime               PEND - Check plugin received no monitoring data
WireGuard wg0        PEND - Check plugin received no monitoring data
WireGuard wg0 Peer pdLb1t5BLDupVDIk3/DKzOmYYf6Ak3ioz9tBFWBT1G8 PEND - Check plugin received no monitoring data
Piggyback file '/omd/sites/timdebruijn/tmp/check_mk/piggyback/rss.timdebruijn.lan/vcsa.timdebruijn.nl': Successfully processed from source 'vcsa.timdebruijn.nl'
No piggyback files for '192.168.1.15'. Skip processing.
[cpu_tracking] Stop [7f4e226cda90 - Snapshot(process=posix.times_result(user=0.010000000000000009, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.010000001639127731))]
[agent] Host is registered for TLS but not using it(!!), [piggyback] Successfully processed from source 'vcsa.timdebruijn.nl', Missing monitoring data for plugins: checkmk_agent, cpu_loads, cpu_threads, df, diskstat, kernel_performance, kernel_util, lnx_if, mem_linux, mounts, postgres_bloat, postgres_conn_time, postgres_connections, postgres_instances, postgres_locks, postgres_query_duration, postgres_sessions, postgres_stat_database, postgres_stat_database_size, postgres_stats, postgres_version, systemd_units_services_summary, tcp_conn_stats, timesyncd, uptime, wireguard(!), execution time 0.1 sec | execution_time=0.100 user_time=0.010 system_time=0.000 children_user_time=0.000 children_system_time=0.000 cmk_time_agent=0.090