I'm attempting to send mail from my app as the current user. When I add in the Delegated Mail.Send API Permission to do this, the status is empty - it is neither 'granted' or 'not granted'; neither is it showing an error. I also tried adding Mail.ReadWrite which didn't work either. I left it a few days to see if it was just being slow to update.
These permissions do not require Admin - it says 'No' in the Admin Consent Required column. I've successfully added other permission types in the past as you can see.
How can I troubleshoot this?