In addition to the steps provided above, you have to also check on the following:
I just had the same problem with programming my own freqs on my BCD436HP. I created everything inside the scanner since I was away from Sentinel. Everything was programmed correctly but the frequency scanning never happened. I finally found out that in Sentinel, you have to select
Edit Profile in the "Edit" dropdown and then turn on the service you have those favorites categorized as.
In my case, I found a few frequencies at my work for video productions going on in the studio and wanted to have them in their own favorites list. Under
Service Type while creating the profile and frequencies, I chose "Media". Back in Sentinel, in the
Edit Profile, "Media" was unchecked which I guess kept it from scanning the frequencies I programmed. Checking the Media box and reloading the list back to the scanner fixed the problem. Sentinel is an amazing piece of software for programming but some things like this can drive you crazy.