Hello,
Based on:
"Can you look into my account I need ******@abbeymeadunder5s.co.uk to be admin, but for some reason its not and i want to use the domain email addresses linked with the account , when I go to log in it says i am a part of the organisation which I am , but I need to be able to edit the addresses so we can use them"
You need to do this through Azure AD/Entra:
Add or change profile information
If this is helpful please accept answer.