I think it would be best to figure out if it is some issue with the characters or some issue with the possession getting through.
Try putting some on tick print stings in one of the characters. Have one print the gotten controller currently in charge of the pawn and have the other print regular “get player controller.” Use different colors for the two print strings and see if they are identical. If they are not, then you know it isn’t possessing the pawn.
If they are the same then it isn’t the possessing that is the issue.