Thank you hiegtx, I will give it a shot when I am home and can access sentinal software.For a trunked system, there are two steps to designating a talkgroup as a Priority channel.
First, tag the TGID as Priority when editing the Department it is in.
Second, in the Favorites list editor, go to the System line.
Turn on trunking priority for the system there. That's under the Options tab.
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You're getting the "Priority scan. No channel" warning because you do not have any conventional channels set as priority.