User Profile

My main Apple ID I've used for 10+ years can no longer log into beta.apple.com or the Feedback Assistant app. When I try to log in with this Apple ID at beta.apple.com, it takes me right back to the same beta.apple.com page, with the same Sign Up and Log In prompts. When I log in using an Apple ID I created with a different email address, I am able to sign in successfully and see the prompts to Enroll in a beta. I've tried this on iOS, Mac, and Windows, in multiple browsers, and on multiple internet connections. Similarly, when I try to log into the Feedback Assistant app with my main Apple ID, I get an error message: "Unable to Sign In to Feedback Assistant. Thank you for your patience. Please try again later." If I then try signing in with a different Apple ID, I can sign in successfully. I contacted Apple Support on Twitter, who attempted to troubleshoot, then redirected me to Developer support because it seemed that my issue was related specifically to their products. But now Developer support says they cannot help me with this and directed me to the Apple Developer Communities forum. Is there someone else I should be getting in touch with who can actually help me with this issue with my account?

I tried to install Swift Playgrounds from the Mac App Store. However, it says I can't install it because it requires 10.15.3. I'm enrolled in the Public Beta program, and System Preferences says there are no updates available. If I unenroll from the Public Beta program, there are still no updates available. Is there no way for me to install this app?