I listen to LA Metro Rail which is NXDN on my 996P2 and 325P2.
Sounds like when in "search" your scanner is searching for the proper audio type and tone, in this case RAN.
When you program a channel, set the Audio Type to Digital Only and then set the RAN to the proper value (I use what is listed in the RRDB). I've got a number of channels for LA Metro Rail programmed that way and the group scans just fine.