Dandy's world lobbies are sometimes like this. This happened to me with a Rodger. He told me I couldn't join bc i was a poppy and i had no trinkets.
Credits to me for making this animation work (also it took a while to find a good clipart picture of Pebble cuz whenever i downloaded it, it wouldnt show up when I tried to put it on here. It took me like 10min to find T-T)