RDS configuration (RDWeb App) errors

Job ID: 32317120

Budget: $10 – $30 CAD

I have done the configuration on the RDS
Except for RDWeb App
I can only run those apps from local network OR outside network because the certificates I installed may not be correct.
I get this kind of error
"Because the remote desktop gateway server address requested and the certificate subject"
and I get the error from the screenshot I uploaded if I run it from outside the network.

Please I need a person who understand English well! Thanks