Other Configuration Manager-related features and issues
command line is working fine now for all servers. it seems that some of the windows 2008 R2 servers having some security related issue that's the reason we noticed the failure of command line.
no need to add user and password for proxy.
msiexec /i mmasetup.msi /qn NOAPM=1 ADD_OPINSIGHTS_WORKSPACE=1 OPINSIGHTS_WORKSPACE_AZURE_CLOUD_TYPE=0 OPINSIGHTS_WORKSPACE_ID="<your workspace ID>" OPINSIGHTS_WORKSPACE_KEY="<your workspace key>" AcceptEndUserLicenseAgreement=1 OPINSIGHTS_PROXY_URL=<<proxyIP:Port>>