My account is personal account. After I clicked "Enroll today", it shows "Sorry, you can’t enroll at this time. Your Apple ID is already associated with the Account Holder of a membership."
I did not set family sharing. The account did not show other related accounts neither. Here are the screenshots.
Karunamahajan
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When I accessed the page "Certificates, IDs, & Profiles", it shows
"Unable to find a team with the given Team ID 'XXXXXXXXXX' to which you belong. Please contact Apple Developer Program Support. https://developer.apple.com/support".
I confirmed my developer account was paid in 6 months and should be valid. I accessed 2 weeks ago without any problem.
This is the screenshot.