I cannot update my Apple ID payment method

I don't see which payment method you are trying to add.

For more information see this article about updating payment methods on various platforms (iPhone, Mac, etc.): If you need to change or update your Apple ID payment method - Apple Support

Refer to this page for Apple Support features ➞ Contact - Official Apple Support

If the presented options do not resolve your issue, keep experimenting with any series of selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

This page has telephone numbers for contacting Apple for support and service ➞ Contact Apple for support and service - Apple Support