Outlook on iPhone not working with iCloud email, but works fine on my Mac?

I put a support request in with Microsoft and am waiting to hear back...but I figured I would see if anyone else was experiencing this while I wait. On my Mac I have Outlook running and my default account is iCloud. I generated an app-specific password, signed in and it works great.

I signed in on Outlook on my iPhone using the same credentials (also tried generating a new app password) and it's so odd...the inbox reflects the state it was a few weeks ago. Nothing is syncing, and I am not receiving new messages. I tried resetting the account on the app, redownloading, etc.

Anything else to try? Has anyone else had this issue?