I did find the link for Windows 10 but not for Linux. There could be a reason they hid it right now perhaps.
https://minecraft.azureedge.net/bin-win/bedrock-server-1.16.10.02.zip
Not a BDS issue but most likely on your account. Check your PC for viruses and change your password on a different device
This is an MCPE issue not a Bedrock Dedicated Server issue. Xbox One are unable to connect with dedicated servers unless it's LAN.
I'm also having the same issue along with this for server side BDS-15849