Unable to submit repair/replace request for Xbox S controller, please help!

My Xbox controller has really bad left stick drift, after trying all the troubleshooting suggestions to no avail, it was suggested to request a replacement controller. I tried to submit this request through my account > devices > controller which brought up the request form to fill out. However, when I get to the part about adding a shipping address it won't let me go past this page. I enter my address (I live in the UK), I press save and it just takes me back to the same page to add an address again. No matter what I do, it won't let me past this page in the process.

I tried using a different device to do it, same problem. I tried using a different browser, same problem. I tried a different wifi network, same problem. I cleared all cookies, cache etc, still the same problem!

I tried using the contact support - the chat bot was no help and when I tried requesting a phone call it just kept saying it couldn't submit the request.

All I want is to have my controller replaced but it feels like there are all these issues and blockers preventing this from happening.

:)