Hi, I'm Elise, and I'd be happy to help with your issue.
It doesn’t actually refer to this certificate being for a thumbprint device, this is just the terminology used. It is basically the serial number of the certificate.
You can safely ignore this error, otherwise if you wish to try and remove it you can try follow the steps in this forum thread:
https://www.tenforums.com/general-support/12469...
Please let me know if you need any further assistance.
Kind Regards,
Elise
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.