My Favero Assiomo duo power meter connects to the garmin 1040 but shows no data with version 27.14. Worked fine with the previous version.
This happened to me after an update a year or so back. (Top tip: don't install updates just before races, as I did...). To be honest, I can't remember which solution worked, but I was just...) able to sort it out before the start. I think I tried removing / re-adding the pedals, and a full shutdown / restart, and that one of those worked - but I can't remember which.