Clan Delivery Missions - Couldn't generate quest

[Roadkill]

I am an officer in a clan trying to take a clan delivery mission in a port belonging to our clan.  I drop the 50k doubloons as required into the exchange chest but repeatedly get the message 'couldn't generate quest'.  Other clan members have tried and are getting the same message.  What are we doing wrong?  We spent a lot of time getting the dobs together moving them to the port and there is no obvious reason why it isn't working.

[Archaos]

Are your quest slots full? I have managed to do a clan resources quest in a port my clan was friendly with and had no problems. It takes a mission slot and 24 hours to get the items.

[Roadkill]

No...I have quest slots available as did each of the clan members who tried it