Cannot sign into live forgot gamer tag password and email no longer exists

2 questions

Do you mean the email associated with the windows live Id is no longer existing ?

And you forgot the password?

If so go to windowslivehelp.com and contact customer support to reset the password

If the windows live ID no longer existing phone Xbox support

I have a very old Comcast email account associated with my Xbox Live gamer tag. I have tried multiple times to change that password, but the account no longer exists. I have another gamer tag associated with my MS Account, but it doesn't have XBOX live.
I could change that password, but now I don't have xbox live. How can this be fixed? I have tried multiple scenarios without luck and am paying for Xbox Live but unable to use it.

Hello,

Thank you for your response.

Since you still have the email address on your Xbox account, kindly try to sign in to the same email on account.microsoft.com > then click on "Forgot Password" > then follow the instructions to reset the account password.

Once the password has been reset, sign in to the account on account.xbox.com > then look at the right top corner of the page to see your Gamertag.

Please check if the gamer tag showing on the page is the same gamer tag you are trying to recover.

I sign in with email and old pass and it leads me to the new unwanted gamer tag. I try and sign in with my email and new password for my old gamer tag and it doesn't accept it.

Will this then allow me to sign up using new email or will I still be linked to existing gamer tag?