I had the same thing happen to me yesterday.
I was sailing my 2021 Hobie Tandem Island offshore in the Atlantic Ocean off the Jersey coast in flat - low wind conditions (wind was ~ 5 mph with gust to 10 mph).
I was tacking down wind and as I was about to turn to starboard... I observed the forward starboard Alama separating from the from the main hull and was pointing at - 45 degree angle to starboard. See photo below.
Hobie TI AKA Joint Pin Failure by
Jim Powers, on Flickr
It took me a minute or so to sort this out. I was hoping the AKA joint connection had just popped out, but as I got closer I noticed the AKA joint had separated with the pin fully missing....
I experienced the same pin failure on my Hobie AI a number of years back....in almost the same location in the Atlantic Ocean....
I eventually got the TI sorted out and lashed the nose of the Alma to the main hull using the free end of the furling line (not the best strategy as this limited furling the sail....).
Thankfully I was only a mile offshore but I still needed to navigate the Townsend Inlet shoals and tidal currents.
The Suzuki 2.5 hp outboard saved the day and got me safely back into the protected bay waters where I was able to sail downwind back to the boat ramp. see photo below.
Hobie TI AKA Joint Pin Failure by
Jim Powers, on Flickr
On shore I inspected the AKA joint and confirmed the pin was totally missing along with the set screw and the square plug that covers the set screw. see photos below.
Hobie TI AKA Joint Pin Failure by
Jim Powers, on Flickr
Hobie Tanden Island AKA joint failure pin drop by
Jim Powers, on Flickr
Now I need to find the part numbers that need to be replaced (assume the pin, set screw, or maybe the whole forward starboard AKA). I bought this 2021 TI used. Not certain of the part numbers. Can anyone help on the part numbers?
Preventative actions planned: 1) check tightness of all AKA pins, 2) add lock tight blue, 3) add 1" by 1" gorilla tape to the bottom of all joints covering the pin to prevent "pin drop out failures".
Thanks