Its a bug. What is happening is that the game is full but it just says no commander slots are available . dice is aware and is working on a fix.
The “No Free Commander Slots” message is appearing because the server is full. In the coming future, this shouldn’t be an issue, because they’re re-enabling Server Queuing (Wait list) to join servers. They had to disable this feature for launch, because BF Premium Prioritization was causing server crashes.
Oh ok this helps me so much thanks bud!