• Get help with the slot-loading SuperDrive - Apple Support
https://support.apple.com/en-us/HT201788
(if portable mac has a built-in optical drive - external won't work)
• How to connect the Apple USB SuperDrive - Apple Support
https://support.apple.com/en-us/HT202665
(if external Apple USB SuperDrive is upside-down it won't work)
Had you tried to see IF the external SuperDrive will accept a disk
when Mac is started in Safe mode? A troubleshooting idea to try.
• Apple Built-in/USB SuperDrive Not Working - Issue Fixes(?) | macdvd.com
(..do not download software ~ this is a "read-only" reference..)
IF you are handy; experienced in DIY troubleshooting, electronic
repair, & take responsibility.? There are fixit sites online to consider.
Good luck & happy computing!🌻🐝