Hello @wouter ,
I yesterday tried to log in with my username on daughters computer and got the same result, same error messages and still was unable to connect to revision control even with my own user.
I’m aware of this restriction (and to be honest we are ready to cheat a little bit here because we are trying to do this only for educational and self-improvement purposes as this could be a great way for me to help her in this process 
), but even if we forget about collaboration option problem still remains - even working solo on any project she can not connect to revision control. And even if that does not prevent her for working in UEFN this error could cause unnecessary inconveniences in future.