From now on, you can invite trusted colleagues or partners to sign in to your AdSense account and also run reports, manage payment information, and generate ad code. In addition, this new user management feature can also be used to change the Google Account login linked to an AdSense account.
There is something rather weird about the google accounts. Some time ago, and I mean a few years ago, when google decided we all had to log in with an account, google linked e-mail addresses incorrectly. I now have the wrong, legacy, address and profile linked on one of the google properties. It's been impossible to change it.