So, I was attempting to teach my two Ninetales-Alola Aurora veil but, it registered as leech life and of course said Ninetales cannot learn it! I'm on a server and we checked that indeed, it was a bug.
Luckily the Game Masters were able to help me by prompting with a command, but obviously not everyone will have this available to them as many servers are very busy, as well as with singleplayer survival, that being not an option at all!

Just a case of a broken TM, for those who might want a good ol' competitive set on any Pokemon with Aurora veil, but most likely would be on ninetales like mine. Someone else checked with JEI, and sure enough the item itself seems to be bugged out. (get it? since leech life is a bug move? ok I'll stop) But again, nobody will have the same luck as me.

Are you able to replicate this in singleplayer with steps? Can't seem to reproduce this myself, tried giving alolan ninetails aurora veil and it worked fine.