Hello, Rich Scarborough.
Thanks for reaching out to our Microsoft Community Forum.
We understand that you're having trouble changing the email address associated with your Microsoft 365 subscription.
Usually when you redeem a subscription to a Microsoft account you cannot change the email address associated while the subscription in ongoing. With that in mind, what's the domain of this Microsoft account? I don't need the actual address. I just need to know if it's @Outlook.com or @Hotmail.com or @Live.com or @MSN.com.
Also, why do you want to change the email address?
Feel free to reply to this thread if you need further clarification.
Sincerely,
Glenn Rue
Forum Moderator
Microsoft Community