Changing RDS FQDN doesn't seem to work

Hi,

Our users access RDS via rds.company.com, but the connection broker's FQDN is broker.company.local.

I therefore ran the PowerShell script here: https://gallery.technet.microsoft.com/Change-published-FQDN-for-2a029b80 to change the internal FQDN to broker.company.com (and it changed it successfully). But then, instead of the warning message shown in the TechNet article, 2 things happen when the application is clicked, 

1) An NTLM window pops up asking for credentials to log on to broker.company.local, and,

2) After supplying credentials, it *still* comes up with the warning message in the TechNet article.

I don't see any errors in the event log. I also needed to create a HOSTS file entry on the gateway resolving broker.company.com, since it couldn't resolve that FQDN otherwise.

Any suggestions as to why it's still coming up with company.local?

Thanks!

Sam