Thanks.
In your logs, the message about the subpanel is a different thing - some custom subpanel you have that is not quite correct.
About the email - If you uncomment these lines in the code, you will get additional information in the logs, which I think will be quite helpful for your case:
This will put some more information in your logs to help you troubleshoot.
You’re not authenticating correctly, the server is rejecting your user/password: I think there can two causes for this:
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SuiteCRM is not recording your password correctly: there was a bug here, but it should be solved in your version. The first log line will help you make sure.
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Some server quirk. The extended SMTP log should give you more details. I know there are open issues with problems authenticating with Microsoft 365 accounts, for example.