

ID and Channels have been checked, rechecked and changed many times. I have spent some time attempting to get the YN-E3-RT and this one (bad unit) 430EX III-RT to link. The YN-E3-RT and both 430EX III-RT's firmware are up to date. The other unit it will not link too ever (we'll call this the bad unit). It's always the same unit and it connects every time (we'll call this the good unit).

The problem is that the YN-E3-RT will only link with one of the 430EX III-RT's. On paper this setup should work faultlessly and the YN-E3-RT is advertised as working with the 430EX III-RT. I have two Canon Speedlite 430EX III-RT's and recently purchased a Yongnuo YN-E3-RT Transmitter to operate both Speedlites remotely from my Canon 200D camera. I'm looking for any suggestions, but I doubt that this can be solved.
