Why won't the Xbox app on Android work properly?

I have been having issues with the Xbox app for android for several months, I would get notifications and messages and party invites to come through but the app itself would never load. And if I tried to quick reply to the message notifications they wouldn't actually send my replies. So the other day I got sick of not being able to use the app at all so I uninstalled and reinstalled to see if that would fix it, it didn't. I can't even log in to the app on my phone. I click the log in button and nothing happens, I click the set up console button it asks for a code from the console. Problem is my console is already set up, and I don't know how to find a set up code to maybe try logging into the app that way. I'm not about to reset my console to try that theory though.