I believe this is a well known issue, but couldn't find it here, so decided to post.
You can only play with the in-game bots on both of these card games as the xavis do not show up. The xavis are required to be there so users can click them to add players. (See Example 1)
(Example 1 - No xavis appear on the app)
Also, while I'm at it, is there a way we could possibly make it so that bots can start the game (as currently only users with the power can)? Perhaps Gamebot should recognise the chat bot (or anyone with a bot pawn) as a bot immediately and use the in-game bots to play moves automatically.