Active Apple Developer membership, but App Store Connect returns INVALIDITCUSER

Hello,

I enrolled as an individual and paid the annual Apple Developer Program membership fee. The Apple Developer website and the Apple Developer app both show that my membership is active through August 20, 2027, and my role is Account Holder. I can also access Certificates, Identifiers & Profiles.

However, every attempt to open App Store Connect redirects me to:

https://appstoreconnect.apple.com/m/INVALIDITCUSER?errorKey=ITC.signin.error.invalidUser.asc

The message says that my Apple Account is not intended for use with App Store Connect / that I must be an individual or team member in the Apple Developer Program. This contradicts the active membership shown in my Developer Account.

Apple Developer Support has already called me and I have open support requests, but the App Store Connect access has still not been provisioned. My situation appears identical to this resolved thread:

https://discussions.apple.com/thread/255265181

Has anyone recently had this exact issue fixed? Did Apple need to manually restore or create the App Store Connect provider/user record, and which support team should the case be escalated to?

Thank you.