This user does not have a Google Account – Analytics problem

If you’re trying to add a new user to one of your Google Analytics profiles, you might get the error:

I found I got this error when trying to add my name@googlemail.com account. I knew the address was definitely valid, it’s an account I use all the time.

In the end, the only way I could get it to work was by changing the part after the at symbol to @gmail.com, even though I use an @googlemail.com address.