Small problem I know but I went flawless once in trials and was not given th grimoire card for the lighthouse.
I really have no interest in trying to go flawless again. I hate trials with a passion and getting it the first time was hard enough.
You can check my account it has definitely went flawless, I was given an adept doctrine as proof.
Is there anyway the grimoire can be unlocked for me as this is obviously a bug.
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This was a known bug but sadly the only way to earn it is to go flawless again. Bungie will not give you it sadly.