Hello Blueye,   Try rebooting the DRAC on those and re Discover.   Next try clear browser cache and retry or try a different browser?   When you discover them, did you check the box that says "Enable trap reception from discovered iDRAC servers and MX7000 chassis."? OpenManage Enterprise Discovery [URL]
Firmware Baseline doesn't see all servers. Just a Few ABSOLUTELLY identical R750 with absolutely identical configuration, which were successfully onboarded, Refreshed, Inventory ran many times, are showing only with IP address, while others are with hostname. When I tried to create a Firmware/Drivers baseline and I am offered a list of all possible servers, I see only servers which are displayed with hostname, servers which everywhere else are shown only with their IP, are not present here. So I am not able to apply the Baseline on them. I tried to delete one of them from the OpenManage inventory (without the forceful options because of the scary warning), onboarded back successfully, but still only showing IP, not hostname.
Firmware Baseline doesn't see all servers