SQL Server Connected system OAuth2.0 Test failure

There should be a more concise error in System Logs > tomcat-stdOut.log. Could you post that exception here? Without a more concise error, we're guessing about many variables related to your Appian configuration and where your database lives.

IF your database is in Azure Cloud, also check these:

• On a different project / platform, AzureTenant JDBC property needed to be added to the JDBC connection string for a Teams integration that also used ServicePrincipal. I'm not sure if that applies to your situation, but it's pretty easy to test.
• Appian might have additional VPN requirements depending on your environment's configuration:
  docs.appian.com/.../Microsoft_Azure_DB_Integration_Appian_Cloud.html

Check logs please and share the error...

Check logs please and share the error...