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Sounds like you bound TAB to something in your controls menu.
It doesn't matter what it is, if it's bound to literally anything at all, you won't be able to open your codex.
Call it a bug, or an oversight... whatever...
You're not the first person to have this issue so a quick search would have probably gotten you the answer a lot faster.
And sorry for my rage, I just got mad because of the issue.