FINALLY FOUND THE ANSWER!
Call Apple Support.
We can't fix it ourselves. They have to fix it manually over the phone. It took waiting on hold for 3 minutes but it's all sorted now.
Use the Apple Developer Contact page to get in touch with them.
Visit https://developer.apple.com/contact/topic/select and then select "Membership and Account" then "Program Purchase and Renewal" and then select a call back.
I hope this helps!
droomdrooms
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Hopefully found an answer! I spoke to Developer Tech Support and apparently my App Store Connect account was connected to both my Personal developer account and another Business one from a company I used to be associated. I had to leave that old team's account within App Store Connect and then reload. My association with that account is now severed and hopefully within 24 hours I should be back up and running!
Same issue. Trying to get through to them on phone support.