At the moment, PowerShell remoting in PowerShell 7 is using Windows PowerShell's microsoft.powershell endpoint as the default one. That endpoint is not even visible/discoverable when you run Get-PSSessionConfiguration.
By default, targets should be PS7 endpoints and you could specify -ConfigurationName microsoft.powershell, if you really want to execute in the context of Windows PowerShell.
At the moment, PowerShell remoting in PowerShell 7 is using Windows PowerShell's microsoft.powershell endpoint as the default one. That endpoint is not even visible/discoverable when you run Get-PSSessionConfiguration.
By default, targets should be PS7 endpoints and you could specify -ConfigurationName microsoft.powershell, if you really want to execute in the context of Windows PowerShell.