Endian's Dimensional Anchor does indeed function similarly to it's D&D counterpart, though how it interferes with Henry's portals (Or anyone else who uses portals for travel) is kinda fuzzy.

To me, what Henry doesn't isn't so much teleportation as much as it is summoning. This is where things get fuzzy because it's one of those "It's basically the same thing, yet not, so it works" sort of things. Endian's Dimensional Anchor would prevent Victorie from teleporting away from or to Endian. However summoning is a different caveat since the intent of the Demensional Anchor is to prevent someone from directly teleporting themselves, but it has a loophole where it doesn't work if someone who isn't the cause of the teleportation brings someone to or from the location. It's something of an overlooked flaw that wasn't considered when it was first implemented. 

Basically, if you try to teleport yourself, it won't work. But if you're summoning or being summoned it ought to work. What makes it different is what is the cause, and what is the subject (Are you teleporting yourself somewhere? Then it won't work. Are you teleporting something else here, or is someone teleporting you? Should work.) Once Endian figures out this flaw in her system she may need some time to perfect a better counter.