Daniel Spreadbury of Steinberg has mentioned repeatedly in the Dorico forum that the older long USB eLicensers don’t always play well with Macs - see, for example, this thread (click)… Several people in the Dorico forum who had these sort of issues with a Mac have found that buying a new USB eLicenser and transferring their licences to it has helped - but there is no guarantee it will work and you have to buy the new eLicenser.
The Steinberg support site has a page on the different generations of USB eLicenser (click).