I manage to upgrade my production environment from 1.16.3 to 1.17 RC1 without any hiccups. Manage to activate the OAuth2 plugin and here's where I cannot proceed further. I'm on Office365/AzureAD.
In Manage -> Plugins -> Oauth2 Client, there's an Instance tab. Do I need to manually create a new Instance? Some fields were populated automatically and I'm not sure what should I modify.
Then in Emails -> Email Addresses (select primary) -> Remote Mailbox, there's another "Config" tab next to "Authentication" after I selected "OAuth2 - Microsoft". The fields here are similar to the ones in Plugins.
Do you have a guide on how to get OAuth2 working? I have completed App registration in Azure AD, however Osticket does not show specific error message other than "Configure Authentication".