Hi, I too have had this issue since public 11.3, I have contacted apple, was on the phone for a while. I need a second Mac with TB3 so I can test that the bridge service actually works. A comment on macrumors suggests that the issue could be related to the fact that the QNAP is using a TB3 - TB2 converter inside, as they said thunderbolt bridge works with a pure TB3 connection.
Joemolomo
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