AuthenticationFailedException: AUTHENTICATE failed during test of OAuth2.0 Exchange connection

[Roy Malcik]

I'm trying to use the new OAuth 2.0 authentication feature from the last Jira 8.13.4 release. I followed the process (configured OAuth 2.0 link, registered and configured application in Azure AD). When I test the Jira mail server, "Authorize" step is Ok. But, at the last step, "Test Connection", I got "AuthenticationFailedException: AUTHENTICATE failed".