Using Outlook for iOS in business environments for email and scheduling
Hi there - Sorry you have been having some issues. I just wanted to let you know that what you are experiencing is likely related to the Basic Auth end of support, you likely have received a couple of emails letting you know you would likely need to make changes to our email programs you are using.
You likely will want to check out this support page -Modern Authentication Methods now needed to continue syncing Outlook Email in non-Microsoft email apps - Microsoft Support)
Or if you install the latest version of Outlook you can easily setup your accounts there and it will work without having to worry about the different authentication setups.