I don't think you can tell them they're free if you have the stronghold. Did Lavok give you the sphere? If you have the stronghold the Knights ask you to help them get home instead of wandering Faerun... You can tell them they might like it here, but... Anyway, a Cowled Wizard will teleport in, and yadda yadda yadda, you can ask him to help you with the Knights, and he'll tell you that Ribald might be able to help. So I'm seriously doubting you got the stronghold in the first place.
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