Same issue....
Xcode 11.7 (11E801a)
macOS Big Sur 11 beta 6
JoneWang
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I'm having the same issue. I can't work lately. 😭
Console log:
DVTPortal: Error:
Error Domain=DVTPortalServiceErrorDomain Code=1100 "Your session has expired.	Please log in." UserInfo={payload={
		creationTimestamp = "2020-09-07T15:04:25Z";
		httpCode = 200;
		protocolVersion = QH65B2;
		requestUrl = "https://developerservices2.apple.com/services/QH65B2/viewDeveloper.action";
		responseId = "aea59541-0752-47fe-8107-97935c66ddb4";
		resultCode = 1100;
		resultString = "Your session has expired.	Please log in.";
		userLocale = "en_US";
		userString = "Your session has expired.	Please log in.";
}, NSLocalizedDescription=Your session has expired.	Please log in.}