Same issue here! On Xcode 11.6 it will complain about expired sessions Console log for 12b3: [MT] IDEProvisioningUI: Error getting the list of teams: Unexpected nil property at path: 'Provider/attributes/developerTeamId' Console log for 11.6:  DVTPortal: Error: Error Domain=DVTPortalServiceErrorDomain Code=1100 "Your session has expired.  Please log in." UserInfo={payload={     creationTimestamp = "2020-08-01T18:02:33Z";     httpCode = 200;     protocolVersion = QH65B2;     requestUrl = "<https>developerservices2.apple.com/services/QH65B2/viewDeveloper.action";     responseId = "<random UUID>";     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.} Things tried so far: Reinstalling XCode Clearing keychain to default New user account on Mac Someone else's Mac Since the Transporter app also shows issues when trying to sign in I suspected it was an issue with the account so I contacted Dev Support who's looking into it now because they don't know what's causing it either.

I can confirm that this is a Big Sur bug. I’ve made a separate partition and installed Catalina on it and the issue doesn’t occur with either Xcode version or the Transporter app. Seems like they might, again, changed the way Xcode (and tools) store account information in the keychain. I’m now going to see if I can successfully import the Apple ID and Code Signing Assets in the Big Sur environment.

I’m now going to see if I can successfully import the Apple ID and Code Signing Assets in the Big Sur environment.  Importing didn't give any errors but it didn't resolve the issue. It still wants you to login again, can't figure out teams.

Same issue still on Big Sur beta 4 and Xcode 12 b4

@valdamnit This is an old thread, the more recent thread is here. Please comment and upvote so that it hopefully be more visible: https://developer.apple.com/forums/thread/656161

There’s a more active thread about it here. Please comment and upvote so that it hopefully be more visible: https://developer.apple.com/forums/thread/656161 Perhaps over there you can also share how you made it work on Xcode 12 because we all have issue making it work on either version.

Found someone with the same issue here that was able to make it work in Xcode 12: https://developer.apple.com/forums/thread/656758 This is currently filed as: FB8253821 (Xcode 12) FB8253769 (Xcode 11.6) FB8253859 (Transporter) FB8254178 (Big Sur general)

It’s tied to this issue: https://developer.apple.com/forums/thread/656161

It’s discussed here https://developer.apple.com/forums/thread/656161

I can confirm that the issue is resolved for Xcode 12 beta 5 on Big Sur beta 4 Xcode 11.6 still won’t work so we’re not out of the woods yet.