I don't know whats going on but im having some problem with doing rdf now. It worked during the day but now, on different chars i get teleported into some "limbo" place in dungeon and cant do anything. I relog or /reload and im back outside dungeon but can never teleport inside and it says i did too many dungeons and i dont have a valid teleport location even though im still in group with the others.
I really don't know whats going on but its weird, at one point i even got a wow error and it closed, while i was in that weird place it teleported me. I didnt change any addons or anything today so it shouldnt be the reason for that.
I did one FoS on shaman but nothing on druid in a long time. The weird part is that i can queue rdf normaly and i just cant get teleported into the dungeon.
as Shred92 said you have triggered "You have entered too many instances recently". So, wait 30-60 minutes
During that period you can not enter in instances.
About RDF: It is bugged. It let you queue for RDF even tho you are not able to join it because you are still on "You have entered too many instances recently" period
Once you trigger "You have entered too many instances recently" it is applied to all of your characters