Apple ID email won’t change on iOS 14

Hi.

I have recently changed my Apple ID email.

If I go to ‘Name, Phone numbers, Email’ of Apple ID settings on my iPhone, I can see my recently updated email: a***.com

If I go back to the main Apple ID settings page, I see my iPhone still refers to my old email (s***.com):

It’s not only a visual effect. Whenever I try to authenticate using Apple ID (e.g. for logging in to https://appleid.apple.com using Safari), iPhone tries to authenticate me using my old email. Apps installation works correctly and refers to my new email.

Not sure how to resolve this.