I'm trying to convert Provider Hosted SharePoint Online application to Azure AD multi-tenant app, but I'm having issues registering existing application on SharePoint.
I created new app on Azure AD where I get application ID and Secret. I try to use that ID and Secret in my SharePoint deployment process but I am unable to register SharePoint application with that ID.
Issue is similar with one shown in question: Can you create a multitenant provider hosted app without using the office store? , however they reuse existing SharePoint ID & Secret but I cannot do that as Azure ID can only create new ID&Secret (meaning i cannot reuse existing one).
I need Azure AD app for OAuth flow because SharePoint app is used as office/outlook add-in, and only way to get user to log (and retrieve its info) in by using graph api.
Basically I'm grasping for straws here, any help is greatly appreciated.