which worked for me in the previous version of Mathematica.
Structures that are in the help files do work, so I can work with Entity["AnatomicalStructure", "Skull"] and do things like AnatomyPlot3D[Entity["AnatomicalStructure", "SetOfBones"]].
I would appreciate if someone could run AnatomyPlot3D[Entity["AnatomicalStructure", "RightHumerus"]] on either 14.x or 15.0 and see if they have the same problem. I could not get online support to do anything for me.
This should be resolved now. Had a couple server side glitches that had nothing to do with the client version number you are using. There are some ongoing and separate ISP issues locally that appear to have been resolved or are in the process of being resolved, but the main issue should be fixed now. Sorry for the inconvenience.