Thanks for prompt response.
My Mac is company issued & company manager so I cannot just add a new user to the Mac.However, I shared the .cer with my collegue and he imported to his Keychain and cannot see the cert either. Very strange.
Please note - that I created a iOS DIstribution cert after I was having issues with the Installer cert import and the iOS Distribution cert imported fine without any issues or without reboot.
Is there any way to run a debug or check logs after the import command completes. I mean the command runs and completes, but there is no indication if the import was successful or not. Assuming the command was sucessful, any way to locate the newly imported cert ?