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If the Tab button for the Dossier isn't working, there's a couple things to do.
What And How?
In Doom Eternal on PC, there's times the Tab button won't work. Apparently, the game has a problem with Alt + Tab out the window to secondary monitor. Whatever the reason, the Tab button will stop working sometimes.
There's a couple things to try if this happens.
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1. Bring Focus Back To The Game
If Tab doesn't work, just hit Left Alt only, and the Tab button will work again.
2. Secondary Command
You can also set a secondary command for the Dossier, which will also make Tab work again after pressing it.
In this case, I mapped it to "\".
Also, I found out that hitting Alt to make Tab work again when I was writing this. Which is easier than bringing up Task Manager or using Alt + Enter twice. I just had the secondary command.
Source: https://gameplay.tips/guides/8741-doom-eternal.html
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