Same problem (05/05/2021) ... I have been trying to log in for 1 week and I can't log in (Error Code "Creeper").
The connection is stable and I uninstalled the problem along with cache files and it does not solve
My platform is Nintendo Switch (Bedrock)
Thanks for your attention
It has also happened to me, my friend from NINTENDO SWITCH cannot join my world, but I can join their worlds.
My friend from NINTENDO SWITCH can join classic servers like THE HIVE but not other cross platform worlds.