WD My Passport Pro

I did…but other than standard troubleshooting (which I’d already tried) they provided no answer to the problem. The issue, as previously stated, is that the drive mounts on one Mac but not others - my conclusion is not that there is anything wrong with the drive, but with Thunderbolt (drivers?) on the Macs that is doesn’t get recognised on. I posted here to see if anyone had had similar problems and if they had managed to solve the issue?