Cannot access Microsoft Mail in mail folders other than Inbox and Draft folder

I need access to my Sent emails but the message says "Nothing has arrived yet". When I hit the sync button, it says "Hold on while we fetch your email" and keeps trying to sync. I'd like immediate access to Sent emails and all the other folders where I move mail.

I have gmail personal account and business account. Both have folders set up for filing. I used to be able to access them.