Server Version:
Purpur version 1.21.1-2298-ver/1.21.1@a61db94
[MarriageMaster] Loading server plugin MarriageMaster v2.7.7

Online Mode: Yes

Bungecord(velocity): Yes

Details
There are no errors. It just doesn't teleport, but in the chat it says that it supposedly teleported, but in fact the player is standing in the same place
Note. The teleport sometimes works, sometimes not

No surprises here - normal application of /marry tp