I tried to move my Kickstarter gateway from V2 to V3.
In the Things Industries website I found this URL. No succes.
In the forum I found several topis and this one works: YES
Important 2 issues:
the gateway ID must be followed by @ttn . Not stated in instruction TTI
the account server must be with https:// (for me https://eu1.cloud.thethings.network) not only a copy form the gateway server address in the TTN V3 console.