This error usually means that the master key associated with this particular Hideez Key does not match with any added keys on the server connected to this PC.
Ways to fix this:
1. Check if the correct server name is indicated in Hideez Server service setting:
- open the Registry Editor, go to Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Hideez\Client and check the server address and adjust to your Hideez Server's name if needed
Then, restart Hideez Service and check back on the error.