I am trying to release an app from Xcode but as soon as I try uploading to the app store or exporting in any fashion, once it checks for signing from iTunes Connect, I recei
I had the same problem.
Solution: Go to Xcode->Preferences->Accounts and make sure that ALL your accounts are connected. If you have several accounts and only 1 of them is not connected you will always get the error, no matter for which account you want to do stuff/export/etc. So make sure ALL accounts are connected without exception. You see a lightning icon next to your accounts that are not connected.
Hope it helps other ppl :-)