Outlook app for iPhone frozen

I have the same issue. Very annoying. Outlook freezes and does not respond to anything. Only thing that works is restarting the phone.

Issue is still not resolved and it doesn't look like Microsoft have any care at all in the world with fixing it.

iOS 13.2.3

Outlook Version: 4.13.3

Best solution I have found so far is to just not use it.

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 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.

This is a terrific summary of what I'm seeing. I'm guessing that the "unable to purchase" error could provide an important clue to Microsoft about the root cause of this problem.