That’s not his username. Usernames are all lowercase.
Check getActivePlans returns success but no active plans (null) - #2 by Bl0n where I just posted the same answer and how to solve it.
I’ve had several other people with a similar question just last week.
And I tried to get a user of mine to give me his username, and it took literally 4 or 5 attempts for them to understand that the big thing under Personal Info that looks a lot like a username isn’t actually the username but a display name instead.
@eransharv I think this is a UI issue that really needs fixed ASAP.
Perhaps you can do something like:
Display name: JohnDoe123
Username: j.doe123
Email: j.doe123@fakemail.com