Outlook on android - receiving notifications, but emails don't show in inbox.

Worked like a charm after countless hours of frustration!  I love you!

I use outlook for android (Motorola Moto G running Android 5.1) and it worked great until a couple of days ago. Now I get notifications of new emails, but the messages don't show up in my inbox. If I click a notification to try and read the email, it says 'Couldn't open message', and takes me back to my inbox, which shows only old messages.

Please help!

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My wife had exactly these symptoms on her Moto G. After lots of fiddling and trying most of the suggestions on these forums, it eventually turned out that the app was configured to only show emails with attachments. Just tapping the little icon in the top right-hand corner of the app (which was showing a paperclip to signify emails with attachments only) and changing it to show 'All messages' fixed things immediately. The resulting icon then appears in the top right-hand corner as an inverted pyramid of lines. Hope this helps.

I will confirm that turning off battery optimization for the Microsoft Authenticator app resolved this problem for me on the latest (June 2019) versions of Outlook, Authenticator, and Android Pie.

After working with my email provider, the problem appears to involve two-factor authentication (seems MS calls it "multi-factor authentication" in their documentation).  Now, we don't have a **** clue as to why that's the case, but it looks like their own Android app and their own Authenticator app, or any other MFA-supporting email client and authenticator app, just sometimes don't work on Samsung devices.  I think this may have something to do with Knox and/or giving Outlook/your mail client Administrative Rights to your device, but it's my device, so 1) No; and 2) It's optional in my case anyway and I aggressively do not care, so we didn't do any more research or do something like create an individual "app password" to bypass it.  I disabled MFA in my Office365 settings and the phone picks up emails fine now.

If you want a broad overview of MFA, https://www.eastfieldcollege.edu/services/onlineservices/pass/pages/set-up-mobile-for-email.aspx has general details that apply to any device connecting to an Office365 account (not just the school's), plus links out to some MS troubleshooting and Office365 admin documentation.

tl;dr -- If you are accessing an account which uses 2FA/MFA using Outlook for Android, ditch the 2FA/MFA or ditch Outlook.

That said, anyone got a better free email client for Android that supports Office365? :/

Microsoft - this is still a PROBLEM, months later!

Just like everyone else on this string, I can get all email on my laptop (Office 365 home account), but there are certain messages that don't show up in the app on my Google Pixel phone. I get the notifications, but can't open the message on my phone as it doesn't appear in the actual app.

Your developers really need to get to the bottom of this. I have tried reinstalling the app and resetting the account, and it's still not syncing all email on my phone. Please find a resolution to this problem, preferably in this decade.