I just got the 8bitdo ultimate 2. It connected fine on Bluetooth the first time i used it, but i was unable to get it to connect with the dock. Then the next week (this week) I’ve been completely unable to get it to connect over Bluetooth but it connects instantaneously with the dock. Like incredibly fast.
I’ve also been unable to map the l4/r4 buttons in trackmania to keys but i think that might be a trackmania issue.