Sadly I think I have no option but to give up.
I added another email address, not one I really want, and then was able to delete the old email address in the security section.
The new email address that I added a few months ago remains and under 'my info' is marked as 'primary' this is the only email address that I want. However I can not use it to log in.
Now when I try to log in the only email I can use is the one just added, the one I don't really want. There does not seem to be a way to log in using my primary email address.
It would appear that when Microsoft try to contact me in the future to renew my subscription they will use the wrong email address, at that time an email address that won't exist. But, doing anything about that is far beyond my ability to fix even after spending hours trying to solve the problem.
If there is a way to simply use my primary email address as the one and only email address for all Microsoft log-in's and transactions I would really love to know how this can be achieved without spending more frustrating hours.
Kind regards,
John