Hello,
You may also need to change your CB's ip so your PCs are placed in the same subnets.
Otherwise, GW don’t recognize your PCs as a Local Address.
In other words, your client cannot contact your CB directly. You can double confirm it by change settings in your client(mstsc -> options -> Do not use an RD GW)
If the Answer is helpful, please click "Accept Answer" and upvote it.