Whenever a friend of mine tries to log in to bungie on the app or the website, it tells him that his psn login has invalid characters. I believe it is the underscores in his name. Does bungie have a work around for this? He can nor redeem any cods or check the app. Very annoying.
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How you log in is the your PSN account: your email address and password. Don't use your PSN username. You should have an account which uses an email and password.