Cannot manage Apple Arcade subscription in App Store...seems a little suspicious to me!

I took advantage of the free month of Apple Arcade. I found I wasn't really using it so I decided to cancel the subscription before being billed...however trying to access the 'manage subscriptions' screen in the App Store on my Macbook Pro simply brings up a white screen that never loads. Every other option I can select will load (Edit Nickname, Edit address etc)...but Manage Subscriptions will not. This strikes me as very suspicious - especially since my auto renew is due in a few days. Is there any other way to manage subscriptions (in a browser for example)?

*Edit - even trying to access my subs through the Apple ID window in System Preferences opens the App Store and that same white window.