Why is this happening?
Try running maintenance in the e-license software?
It means some hardware change happened that stopped the SeL from being recognized. Elicenser Maintenance does not fix this.
Read this to understand: https://helpcenter.steinberg.de/hc/en-us/articles/115001583784-About-licenses-Soft-eLicensers-and-USB-eLicensers
If you have soft elicenses licenses on the SeL you can reactivate them.
Thank you for rectifying this.