Hello
I have been fighting with this problem in the last 24hours… LOL
Resolved by installing an old version of Microsoft OLE DB Driver for SQL Server. I my case, with version 18.02 work fine
Checmk RAW 2.2.0b3, Version: Microsoft SQL Server 2016 (SP2) (13.0.5108.50) - Standard Edition (64-bit); with last version of plugin from Githug checkmk/mssql.vbs at master · Checkmk/checkmk · GitHub
Now… lets look at the data collected