"Unable to authorize the listed DLC"

[doniextreme]

entre na pasta C:\Users\[USER]\Documents\BioWare\Mass Effect 3\BIOGame\Config e renomeie o arquivo OnlineProfile.profile pra OnlineProfile.profile.bkp e entre no jogo...

[cmills1095]

2. Log into http://social.bioware.com using your origin ID. Just doing this should help. But just in case look around for anything that synchronises your game and galactic readiness data.

Anytime I get the "CAN'T AUTHORIZE DLC" message I got to http://social.bioware.com and just log in again and it solves the problem. I've had to leave the tab open. It's tedious, but so far it's worked every time.

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This worked for me.  Thanks for posting this