It does not show up on the list of dungeons.
It’s just not there to select.
This is not a bug. Grim Batol is only playable at level 80 in Mythic mode, and you can’t queue for it.
I have done it many times on Heroic when queueing random dungeons.
You can look at my achievements, Heroic: Grim batol - 9/11/2024
It should also be available as heroic difficulty in the group finder. The seasonal legacy dungeons being available as heroic and m0 is new to TWW. I’m not in game currently to check my group finder.
You can’t specifically queue for Grim Batol; you have to do it randomly. hover your mouse over the random dice its there
For some reason though unlike the heroic dungeons of TWW it is only once per day. That may be why it is missing for you.
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It doesn’t have the 
Icon next to it like they usually do when you’re locked, it’s just not there.
I also specifically queued fro Necrotic Wake, and I can still queue for it. Same with Stonevault, which I specifically queued for like 3 times today.
The thing is that I did this previously already though last Wednesday.
Yep that is what it is doing to me as well. Quite annoying because that trinket is BIS for most of us I think.