"Miss the window to do convoy? eh, you're already doing convoy .. If you're talking about submitting the convoy to your destination and cannot hand-out the convoy, then just click the "Convoy the objects to the Hidden Rain" note in your mission list .. Or, refresh your game and run your convoy again .. as long as you still have time to do it which from your screenshot still have 21:45 before it expires ..

even u not claim it today . tmr it will show on convoy interface to claim it

and u still can do ss convoy again.

I have also had this problem. refresh the game and hope you don't get plundered by the extra time this gives to plunderers.