Good evening I have a problem with fifa 22, I cannot change the number in career mode. I tried with another backup and the same problem persists after a few games played.
First of all, let me just commend you on how clearly you showed the issue about which you are posting. I do not play career mode, but I may be able to assist.
May I ask: do other changes you make take effect? For example, if you change the shirt to tucked in or something along those lines are you able to save them? If not, there must be a step you are overlooking... perhaps needing to click save again and then going back into the edit player menu in order to see the changes.
Is it possible that you are unable to change to a number that is already in use by another player on the squad?
Finally, a simple workaround would be to edit the squad file using RDBM and just change it that way.
Let me know if I can assist further (if I have assisted at all lol)