Some of these may help.
https://serverfault.com/questions/657918/remote-ps-session-fails-on-non-domain-server
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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Overview: I have a server running non-domain windows server 2022 non desktop experience that I want to manage with server manager, and I keep getting a WinRM error no matter what I try
Error
The WinRM client cannot process the request. If the authentication scheme is different from Kerberos, or if the client computer is not joined to a domain, then HTTPS transport must be used or the destination machine must be added to the TrustedHosts configuration setting. Use winrm.cmd to configure TrustedHosts. Note that computers in the TrustedHosts list might not be authenticated. You can get more information about that by running the following command: winrm help config. For more information, see the about_Remote_Troubleshooting Help topic
I have tried to add the servers to the trusted hosts, read every article on the entire internet, tried every possible login, and nothing works, and please don't tell me to ask my system administrator.
Some of these may help.
https://serverfault.com/questions/657918/remote-ps-session-fails-on-non-domain-server
--please don't forget to upvote
and Accept as answer
if the reply is helpful--