I am trying to sign in after changing my primary alias email.

Do these applications also tell you that the account does not exist?

it says its active

my main problem is on the xbox app as it says my account doesnt exist

i made the change recently a few days ago and on my desktop and i cannot access the xbox gamepass

yes

but on my web browser it does

Verify that your subscription is active at this link using the new e-mail address

https://account.microsoft.com/services