The 'Apple Developer Program License Agreement' has been updated
I had to log into Apple Store Connect, access "Agreements, Tax and Banking", accept and fill a new agreement.
That just happened to me .. but it didn't show the toast notification with "Accept" when accessing Apple Developer.
Login to your Apple developer account and accept updated license agreement:
https://developer.apple.com/account
Note: Popup blocker can block this notification popup window. (Ensure your web browser's pop blocker is not enabled, if this notification is not visible to you)
You should go to the Apple Developer Center…
https://developer.apple.com/account