I'm having the same issue. I put a ticket in with Apple support...they replied that they should get to me tomorrow...awesome. Anyway I followed the instructions in your post just to see if I was getting the same and I seem to have a different issue - I am posting the entire log but going through it, it seems :
DVTPortal: Service '<DVTPortalViewDeveloperService: 0x7ff6056103a0; action='viewDeveloper'>' encountered an unexpected result code from the portal ('1100')
2018-05-04 12:46:10.961 Xcode[67026:30975524] DVTPortal: Error:
Error Domain=DVTPortalServiceErrorDomain Code=1100 "Your session has expired. Please log in." UserInfo={payload=<CFBasicHash 0x7ff606593f00 [0x7fff9eaeeaf0]>{type = mutable dict, count = 9,
entries =>
0 : responseId = <CFString 0x7ff606e41e50 [0x7fff9eaeeaf0]>{contents = "d7729402-1f38-43fd-8175-6d54cd04136e"}
2 : <CFString 0x7fff9ea11b58 [0x7fff9eaeeaf0]>{contents = "protocolVersion"} = QH65B2
3 : <CFString 0x7ff6050416a0 [0x7fff9eaeeaf0]>{contents = "requestUrl"} = <CFString 0x7ff6065a2ee0 [0x7fff9eaeeaf0]>{contents = "https:/
6 : <CFString 0x7ff6036dfad0 [0x7fff9eaeeaf0]>{contents = "userLocale"} = en_US
8 : resultCode = <CFNumber 0x44c37 [0x7fff9eaeeaf0]>{value = +1100, type = kCFNumberSInt64Type}
9 : userString = <CFString 0x7ff606b34df0 [0x7fff9eaeeaf0]>{contents = "Your session has expired. Please log in."} 😟
10 : <CFString 0x7ff6056553c0 [0x7fff9eaeeaf0]>{contents = "resultString"} = <CFString 0x7ff606e0eb10 [0x7fff9eaeeaf0]>{contents = "authentication.failed"} 😟
11 : httpCode = <CFNumber 0xc837 [0x7fff9eaeeaf0]>{value = +200, type = kCFNumberSInt64Type}
12 : <CFString 0x7ff60658c600 [0x7fff9eaeeaf0]>{contents = "creationTimestamp"} = <CFString 0x7ff606b18100 [0x7fff9eaeeaf0]>{contents = "2018-05-04T16:46:10Z"}
}
, NSLocalizedDescription=Your session has expired. Please log in.}
2018-05-04 12:46:10.964 Xcode[67026:30975525] IDEDistribution: Failed to log in with account 'xxxxxxxxxxx while checking for an iTunes Connect account 😟
2018-05-04 12:46:10.969 Xcode[67026:30975154] Could not find image named 'ActionTemplate_Gear'.
2018-05-04 12:46:51.378 Xcode[67026:30975390] DVTPortal: Service '<DVTPortalViewDeveloperService: 0x7ff5ffc0cc30; action='viewDeveloper'>' encountered an unexpected result code from the portal ('1100')
2018-05-04 12:46:51.379 Xcode[67026:30975390] DVTPortal: Error:
Error Domain=DVTPortalServiceErrorDomain Code=1100 "Your session has expired. Please log in." UserInfo={payload=<CFBasicHash 0x7ff6046f8b40 [0x7fff9eaeeaf0]>{type = mutable dict, count = 9, 😟
entries =>
0 : responseId = <CFString 0x7ff606228120 [0x7fff9eaeeaf0]>{contents = "b889550f-5632-4cbf-b7c5-1192d29e6b58"}
2 : <CFString 0x7fff9ea11b58 [0x7fff9eaeeaf0]>{contents = "protocolVersion"} = QH65B2
3 : <CFString 0x7ff5fe9e3f70 [0x7fff9eaeeaf0]>{contents = "requestUrl"} = <CFString 0x7ff6046f7840 [0x7fff9eaeeaf0]>{contents = "https:/
6 : <CFString 0x7ff5fe9e8090 [0x7fff9eaeeaf0]>{contents = "userLocale"} = en_US
8 : resultCode = <CFNumber 0x44c37 [0x7fff9eaeeaf0]>{value = +1100, type = kCFNumberSInt64Type}
9 : userString = <CFString 0x7ff5fb44e9f0 [0x7fff9eaeeaf0]>{contents = "Your session has expired. Please log in."} 😟
10 : <CFString 0x7ff6053f7060 [0x7fff9eaeeaf0]>{contents = "resultString"} = <CFString 0x7ff5fe96f7a0 [0x7fff9eaeeaf0]>{contents = "authentication.failed"} 😟
11 : httpCode = <CFNumber 0xc837 [0x7fff9eaeeaf0]>{value = +200, type = kCFNumberSInt64Type}
12 : <CFString 0x7ff602c62da0 [0x7fff9eaeeaf0]>{contents = "creationTimestamp"} = <CFString 0x7ff60519e3c0 [0x7fff9eaeeaf0]>{contents = "2018-05-04T16:46:51Z"}
}
, NSLocalizedDescription=Your session has expired. Please log in.}
2018-05-04 12:46:51.394 Xcode[67026:30975154] Could not find image named 'NSImage'.
2018-05-04 12:46:51.399 Xcode[67026:30975154] Failed to connect (privacyToForgot) outlet from (AKSignInPromptController) to (NSLayoutConstraint): missing setter or instance variable
2018-05-04 12:46:51.399 Xcode[67026:30975154] Failed to connect (usernameToPrivacy) outlet from (AKSignInPromptController) to (NSLayoutConstraint): missing setter or instance variable
2018-05-04 12:46:51.399 Xcode[67026:30975154] awakeFromNib called
2018-05-04 12:46:51.407 Xcode[67026:30975154] awakeFromNib called
2018-05-04 12:46:59.875 Xcode[67026:30975154] [MT] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/DVTFrameworks/DVTFrameworks-14133/DVTKit/Portal/DVTDeveloperAccount+KitAdditions.m:105
Details: Failed to save credentials in keychain for user xxxxxxxxxxxxx: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service named com.apple.dt.Xcode.KeychainService" UserInfo={NSDebugDescription=connection to service named com.apple.dt.Xcode.KeychainService}😟
Object: <DVTAppleIDBasedDeveloperAccount: 0x7ff602b3d040>
Method: -reauthenticateUsingHostWindow:callback:
Thread: <NSThread: 0x7ff5f9506fe0>{number = 1, name = main}
Please file a bug at http://bugreport.apple.com with this warning message and any useful information you can provide.😕