Familiar is missing.

[Anarcoplayba]

What happened: I did level up, changed the familiar, tried it, did not like it (the description did not match the abilities) and changed again. This second time, I did not test the familiar.

Now, I tried to summon it, the prompt appeared, but the familiar not. The button changed from summon familiar to unsummon familiar, but no unsummon happens.

[Nezmith]

I believe this is a common bug for anyone capable of untargeted player-based summons where if there is not enough room around the caster, the creature will not spawn at all. If I'm not mistaken it's a problem with the base game and not the server. This is usually fixed by logging out and back in, after which you need to rest to attempt a summon again.