Thanks a lot Wessley but also I saw that the issue is because I have a snmp_community to public even of host who used the cmk agent.
I edit host and delete one attributes and seams work after:
action=edit_host -d ‘request={“hostname”:“my-host”,“unset_attributes”:[“tag_snmp_ds”,“snmp_community”]}’
And after apply changes, the Wato now work for this hosts.
Regards
Ugo