Hello, thanks for the message. I have tried that and it still doesn't work. I've also just tried revoking access to Google within the Connected Services, but no luck. I'm still stuck with this problem:
I'm logged in with the original Gmail address
I try to change to the new Gmail address within the security summary, but I'm told it is already in use
I log out and try to log back in with the new Gmail address, looking for the option of "forgot password" (even though I don't remember creating a separate account with this email)
I get the message saying "there is no account for the username or email you entered"
So I'm stuck in a loop.