I was working on a Monk NPC and have access to the PHB, but Sentinel is not appearing as a feat option. I actually had it on the character, was working on making the NPC a different level, found it had been replaced by Alert, and now Sentinel is not showing on the drop down list. No one else has access to my account.

Does the character already have the feet? On the character sheet, go to “Features and Traits”—>”Feats”—>”Manage Feats” and see if it appears there.

And I am an idiot. That was one of the reasons I frickin' chose variant human in the first place. Herp da derp da derp

Thanks.

Happy to help.