I've notived my Apple ID is not been accepted within XCode when I try add an Apple ID in the XCode accounts pane of preferences.
I have tested the account details in both the member ceter and itunes connect sites and the account is fine.
When I add the account details and click 'Add' I get the message:
firstname.lastname@example.org could not sign in. Please sign in with an app-specific password. You can create one at appleid.apple.com
Any ideas? I've updated XCode (7.2.1) and Yosemite (10.10.5), rebooted etc but same thing everytime.
Note: I have a second apple id which does NOT have a developer license, I use this for my ipad store purchases and this logs into XCode fine strangely.