Question when using Rork to Sign in Apple Developer Account

Hi,
When I used Rork to sign in Apple Developer Account to test my App, I got this message below

"Apple rejected the sign-in request before checking the credentials (Apple app-token request, HTTP 503). The client identity this app sends is probably out of date."

Screenshot below

Does anyone knows why?

What should I do?

Thanks!

That message doesn’t indicate that your password is wrong. It says Apple rejected Rork’s app-token request before checking the credentials, and it specifically mentions the client identity Rork sent. That points more toward Rork’s sign-in integration or a temporary service issue than a problem with your developer account or certificates.

Try signing in directly at developer.apple.com. If that works and only Rork fails, send Rork support the exact error and time it happened and ask them to check their Apple sign-in client. Only enter your Apple ID details on Apple’s own sign-in page, and don’t send anyone your password or verification code. If Apple’s own site gives the same error, check Apple System Status and contact Apple Developer Support.