Hey Mike,
Is this license hosted on a server?
The most common cause of this error is due to the drivers being out of date on the server, workstation, or both. If you do have a server can you confirm if you've updated both server and workstations to the 8.21 runtime installer below.
https://supportportal.gemalto.com/csm?id=kb_article_view&sys_kb_id=61fb0ee1dbd2e78cfe0aff3dbf9619ab&sysparm_article=KB0018320
Let me know if this is the case and the update resolves the issue.
Regards,
Shane Lyons