Why can't I change my profile pic on the Xbox App?

If you are trying to upload a custome gamerpic, the feature has been disabled for the foreseeable future due to the servers being at their max at the moment due to the recent world events that everyone is facing. More info on the support page here
https://beta.support.xbox.com/

Hello im Tony with the Xbox ambassador program part of your problem might be that you arent old enough or that your devise no longer supports the app or maby you need to update your age in the Microsoft account settings

Currently a lot of people stay at home during the Corona pandemic and playing on Xbox Live. A lot of people are also trying to customize their gamerpics, and since these are always moderated and checked by a member of the Enforcement Team, they are just
overwhelmed by the amount of Gamerpic changes.

That, combined with the fact that the Enfocement Team is also understaffed because of Corona precautions, they temporarily stopped people from being able to update their Gamerpic.

Please wait a few weeks, and they will re-enable the feature.

Hello CrudestBarley40 !
Let me introduce myself, I am Maxime VENTURELLI - MARIGNY from the
XBOX ambassador service.
Sorry for your problem.
First of all, how old are you ? If you are under the legal age of your country (the age of
majority), if you are a child, you cannot change gamerpic to put a personalized image (a selfie for example). This is why you cannot upload your image. If you are ever an
adult, consult the site https://beta.support.xbox.com/help/account-profile/profile/change-gamerpic-on-xbox-one to find a solution.
I hope your problem is quickly resolved!
My gamertag : Doudou2657
Have a nice day !

Im having the same problem. I just want to upload a picture... But nope try again in a little while comes up.