Outlook app for iPhone frozen

Same issue, using 13.2.3 and its been happening on and off since the last update.

Same here. Frozen until reboot of phone. Iphone 8 with ios 13.2.3.

after reboot will work on first launch but then screen frozen even after killing the app. I have never seen this before with any other ios app, and points to a microsoft issue.

This is for a phone under itune profile, exchange 365.

Any eta as this makes it unusable?

I have the same issue - it started a couple of months ago and has persisted through a couple of iOS and Outlook versions.  Currently I'm on iOS 13.2.3 and Outlook 4.13.0

What I have noticed is the Outlook app seems to freeze at the point when you open it and it's checking into the O365/Exchange/AD service to refresh the email folders.  When I restart my iPhone to kickstart it again, I get a message saying "unable to purchase".  Now, this message doesn't appear when I restart my iPhone in any other situation, only after this error in Outlook mobile app has occurred. So it seems to be directly related to the Outlook mobile app rather than the iPhone itself.  I've checked through all my phone settings to ensure that everything is correct and current, which it is, but even then, my Office 365 account is a work one so it's not even something that I have purchased myself.   

I've come to the conclusion an error has crept in to the Outlook mobile app when it connects into the  service upon opening and maybe at the point it's verifying subscription of the account or policies for the account - it then just gets stuck rather than timing out and trying again later or letting the user manually refresh the content; judging from how many people have reported this issue online, it seems to be happening for a while and not specific to iOS 13.X.  It doesn't seem to be affecting any other Microsoft app on my phone, just Outlook.  It's a shame, because before this, it was working great for me for over 2 years.  Now I honestly don't know what to do - it's my work account in there and we're unable to to use any other application, but I can't restart my mobile each time I want to check my email!

Just adding this additional information to see if anyone is noticing similar symptoms.

I have exactly the same issue, including the the "unable to purchase". A reboot gets it going again.

I've found I can logon to office.com using edge on ios, so thats potentially a work around if you need mail or calendar.

I find this incredibly annoying as previously I was able to connect to my outlook account via the native mail.app and calendar.app on ios, which in turn meant I could see these details on my apple watch. 

This bug would have to be the worst aspect of our move to office365.

That is exactly the same as my situation, very well summarised, hopefully Microsoft sort it out soon!