SCVMM Unknown Error 0x80338104

If you get the below error message on SCVMM while connecting to your hosts :

VMM does not have appropriate permissions to access the WSMan resources on the vmtest server.

 (Unknown error (0x80338104))

Make sure you have the Service Account for VMM is under Local Administrator Group of each host you manage and this is not blocked by group policy enforcements.

SCVMM Error 403 : %ComputerName; is not a valid network computer name

While adding your Hyper-V hosts to your VMM inventory. If you get the error below :

Error 403 : %ComputerName; is not a valid network computer name

please make sure you are resolving the DNS entry for that host correctly. Especially check /etc/hosts file for any incorrect static entries (that's was the problem in my case)