To make more ANT IDs available the format was changed from 16bit to 20bit. Most newer devices will handle the 20bit size correctly.
Older devices such as the Edge 500 are excepting the 16bit format.
It would appear that TrainerRoad and Zwift are also using the 16bit format.
If you need to know what your 20bit ID will be when being processed by a device or application that is using 16bit you can use the excel MOD function.
MOD(left-pedal-id, 65536) or MOD(left-pedal-id, 2^16)
So for example an ANT ID of 0345091 would show as 17411