Insteon pluggin problem with 21 devices not recognized out of 60

I have installed insteon devices on my HA, however i have 21 switches (addresses) that have not appeared in HA. I am truly a novice and have no idea how to recover the 21 switches that a are not listed in y dash board. Can someone advise me on that I should do? All the devices that are installed except 2 are working fine with all them tied into Alexa with scenes and schedules. It would be nice to be able to recover as many of the others switches as possible…