RDS 2012 - Certificate Mistmatch

Question

I am getting the most annoying error with my RDS 2012 Setup.
certificate mismatch and double password prompts when trying to connect to my RDS setup.
I have tried all that's out there and have got no positive results.
All roles are on identical on 2 servers. the RDCB is in HA Mode.
I keep getting the Certificate mismatch error.
Already have a public or external SAN certificate assigned to all roles.
Ran the powershell and wmi query to ensure the correct url is used when connected to gateway but I still get the double prompt when launching the remoteapps.
I even tried the approach by cleaning IE's history, data to get the RDPSHplugin and its not helped in my case.
All servers run 2012.
I need some urgent assistance, please and thank you
I have also checked and rebooted the RDS environment multiple times.
All certs show valid. the mismatch also goes to another cert in my environment which is utilized by OWA.
Please help me.

Answer 1

I downloaded the script to C:\ and tried running it - no luck
PS C:\> .\Set-RDPublishedName.ps1 "remote.domain.com"
Security warning
Run only scripts that you trust. While scripts from the internet can be useful, this script can potentially harm your
computer. Do you want to run C:\Set-RDPublishedName.ps1?
[D] Do not run  [R] Run once  [S] Suspend  [?] Help (default is "D"): R
iwmi : Privilege not held.
At C:\Set-RDPublishedName.ps1:9 char:11
+ $return = iwmi -class "Win32_RDMSDeploymentSettings" -namespace "root\CIMV2\rdms ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Invoke-WmiMethod], ManagementException
    + FullyQualifiedErrorId : InvokeWMIManagementException,Microsoft.PowerShell.Commands.InvokeWmiMethod
I also tried it from the other HA RDCB server.
PS C:\> .\Set-RDPublishedName.ps1 "remote.domain.com"
Security warning
Run only scripts that you trust. While scripts from the internet can be useful, this script can potentially harm
computer. Do you want to run C:\Set-RDPublishedName.ps1?
[D] Do not run  [R] Run once  [S] Suspend  [?] Help (default is "D"): R
Set-RDClientAccessName : A valid fully qualified domain name (FQDN) for the server was not specified.
At C:\Set-RDPublishedName.ps1:22 char:1
+ Set-RDClientAccessName -ConnectionBroker $ConnectionBroker -ClientAccessName $Cl ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Set-RDClientAccessName
I also tried is this way- 
PS C:\Users\administrator.TBCL\Downloads> .\Set-RDPublishedName.ps1
Security warning
Run only scripts that you trust. While scripts from the internet can be useful, this script can potentially harm your
computer. Do you want to run C:\Users\administrator.TBCL\Downloads\Set-RDPublishedName.ps1?
[D] Do not run  [R] Run once  [S] Suspend  [?] Help (default is "D"): R
cmdlet Set-RDPublishedName.ps1 at command pipeline position 1
Supply values for the following parameters:
(Type !? for Help.)
ClientAccessName: remote.domain.com
iwmi : Invalid namespace
At C:\Users\administrator.TBCL\Downloads\Set-RDPublishedName.ps1:9 char:11
+ $return = iwmi -class "Win32_RDMSDeploymentSettings" -namespace "root\CIMV2\rdms ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Invoke-WmiMethod], ManagementException
    + FullyQualifiedErrorId : InvokeWMIManagementException,Microsoft.PowerShell.Commands.InvokeWmiMethod