My GitHub account gets ERR_TOO_MANY_REDIRECTS on the Copilot signup/onboarding page.

[kusillafab]

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My GitHub account gets ERR_TOO_MANY_REDIRECTS on the Copilot signup/onboarding page.
I already tested in incognito/private mode, and the error is the same.
Another GitHub account works normally on the same device and browser.
So this appears to be account-specific rather than a browser or network issue.
Please check whether my account is stuck in a Copilot signup loop, billing state issue, or eligibility state.