This happens when Apple Developer certificate is expired and you need to contact the developer.
Ignore this it’s already installed. In project settings it should be with “”
Make an app specific password. Use that password on impactor instead of regular itunes password. Alternatively you can turn off two factor authentication. Both are done at http://appleid.apple.com/ . A guide on how to do so; https://support.apple.com/en-us/HT204397
You may get this error if you disable 2 factor authentication