I signed in to my cousins account on the same ps4 and he could sign in to bungie but i sign in to mine and it doesn't connect and u know the worst thing is its on the release day of house of wolves it was working yesterday.
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Just to be sure: You were signed in on your account. Then signed in your cousin's account. Then went back to your account, but can't play Destiny. Correct? Start with restoring your license: https://www.bungie.net/en/Help/Article/12183