Why is it impossible to get WAC gateway working?!

[rboterenbrood]

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Working with Windows Admin Center seems sooo easy according to this: https://www.c-sharpcorner.com/article/windows-admin-center-setup-and-configuration-for-server-and-system-management But my WAC gateway setup refuses to manage other servers with the error: Connection error Connecting to remote server msa-ras.mco.local failed with the following error message : WinRM cannot complete the operation. Verify that the specified computer name is valid, that the computer is accessible over the network, and that a firewall exception for the WinRM service is enabled and allows access from this computer. By default, the WinRM firewall exception for public profiles limits access to remote computers within the same local subnet. For more information, see the about_Remote_Troubleshooting Help topic.

I've followed all the steps in https://charbelnemnom.com/how-to-enable-single-sign-on-sso-for-windows-admin-center/, tried disabling the Windows firewall, tried the PoSh command " Set-ADComputer -Identity (Get-ADComputer host) -PrincipalsAllowedToDelegateToAccount (Get-ADComputer wac-gateway)" (which doesn't seem to do anything, though).

WAC Gateway is useless. Seems like I've got to instruct my admins to install WAC Desktop mode on all their devices :-((