My apologies. I was referring to the Android Fordpass version. After refreshing the app several times, the trailer light check reappeared under "features & settings". hmm....
Good question. I'm not 100% sure. They said they tested "everything" and all diagnostics passed. You point is well taken and I'll watch for further issues and have the battery tested.
It's there in Fordpass V4.23.0 but removed in 4.23.1. They fixed the departure scheduling bug in 4.23.1 but failed to note in the release notes that trailer light test feature was removed.
I've had all the outage problems described in this thread with my 2023 Lightning (multiple times). Contacted Ford, took to dealership, all diagnostics were ok, performed all the resets and reinstalls but the only thing that worked was disconnect/reconnect the LVB. Clearly the onboard modem...