Login into your profile on the title screen of the xbox. Launch Destiny but dont press a to sign into it. Log out of your xbox live profile then back in and then press a to sign into Destiny. Not sure why but it worked for me and some others as well. Good luck
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I was excited when i saw this hoping it was the solution I needed but sadly no it seems to have not worked for me thanks for the suggestion though
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Not sure why it worked for me yesterday but its acting up again so yeah.