You have joined too many parties recently...
Obviously working as intended.
Join 2 parties too fast – blocked
Advertise party in LFG too fast – blocked
Type in map chat too fast – blocked
Reply in forums too fast – blocked
IGN 7.6/10 – Not enough QoL restrictions
Don’t you love it when you join a bugged LFG post, or pressed the join button a few milisecond slower than someone else and it bugs out as “You have joined too many party recently” for several minutes :p