Subscription cancellation fails with 401 error on macOS Sequoia

I am trying to cancel a subscription for at least an hour. The 'Cancel Button' hangs and does nothing, opening the Inspection network tabs seems to mention that the /cancel endpoint returns 401. I cant find and way to contact apple support without calling them or using an app that does not work on mac OS. Any ideas?

(tried from Firefox,Chrome,Safari)

[Edited by Moderator]

Original Title: Unable to cancel subscription