we have encounter with SQL authentication failed error, this issue reported by DBA team, after DEBUG and checking logs we found same error under application logs.
Can you check with your development team, if there is any testing going on to add below option under “SQL Server User Experience Monitor” template
Use Windows Authentication only – if we get this option under template no one will get SQL authentication failed error.
As currently there are only two option available “SQL Authentication” and “Use Windows Authentication first then SQL Authentication”.
thanks
Sumit Goel