Get-BrokerMachine or any other Remote Powershell SDK cmdlet returns the following message:

An error occurred while making the HTTP request to https://<CONNECTOR_SERVER_FQDN>/Citrix/SdkRouter/. This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case. This could also be caused by a mismatch of the security binding between the client and the server.

+ Get-BrokerMachine -MaxRecordCount 5000 | ? { $_.DesktopGroupName -eq ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Get-BrokerMachine], SdkOperationException
+ FullyQualifiedErrorId : Citrix.XDPowerShell.Broker.UnexpectedException,Citrix.Broker.Admin.SDK.GetBrokerMachineCommand

Enforce TLS 1.2 communication by running the following Powershell cmdlet:

New-ItemProperty -path 'HKLM:\SOFTWARE\Microsoft\.NetFramework\v4.0.30319' -name 'SchUseStrongCrypto' -value '1' -PropertyType 'DWord' -Force | Out-Null 

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Problem Cause

Since Citrix Cloud supports only TLS 1.2 and above, if Remote Powershell SDK server is running with the default protocol, cmdlet will fail with certificate mismatch error.

https://docs.microsoft.com/en-us/windows-server/identity/ad-fs/operations/manage-ssl-protocols-in-ad-fs#enabling-strong-authentication-for-net-applications

https://support.citrix.com/article/CTX245765