Hello,
I have created new 2016 standard connection broker server and also have installed SQL 2016 Express on to the same server for Connection Broker HA. Is this even possible or compatible? Also, When I am configuring the HA for connection broker I am getting error saying that It can't find the Database and need SQL native client on the connection broker. I do have firewall rule for UDP 1433 to be able to access SQL and have permission with Round Robin DNS and security group for the connection broker.