I sure hoped you paid the service department as it is not a manufacturer defect but an issue with the items you installed or the installation of the items. LED bulbs do not have the same electrical draw as the filament bulbs that the signal switch and relay were designed for. I would check the connections from the LED foglights to the turn signals behind the mirrors making sure they are snug and snapped together. I would also run a zip tie to keep the connectors from pulling apart. I would also get a high quality LED turn signal flasher too that others have had good luck with. Pathfinder sells them if needed.
About a month ago, my turn signals stopped working on my 2015 Wing. I was riding and when I hit the signals, nothing seemed to happen. Took the bike to the shop and it spent the next three weeks there all taken apart with the Mechanic and Honda on the phone trying to figure out what was wrong. Finally came down to replacing the turn signal cancellation switch and a relay, which was replaced with some kind of "LED Relay".
Rode the bike about 250 miles or so with no issue after that. Put it away for a week, then went out for a ride today and the signals stopped working again.
Went back to the shop (another 37 miles) and they didn't work the whole time, until the last turn I made to go into the shop parking lot. They continued to work while they were checking me in, and then started working on and off.
We noticed that if you tapped on the fairing just below and forward of the mirrors where the fairing kind of raps around the forks, the signals would begin to work. Tap there again and they would stop. After awhile of trying to figure that out, the signals just stopped blinking again.
My lighting set up is the following. I have the Electrical Connections LED bulbs in the high and low beams. I have LED turn signals in the rear and led tail lights. I have the Add-On Fog Lights, which look just like the SoCal daytime running light, foglight, turn signal combo.
I need the bike in a week for a trip up to Canada, so I'm getting pretty nervous. Any ideas would be really appreciated!!!