We also had Pulseway cause the same issue with our Veeam backups (vss errors). The previous poster did not post detail on his fix so I will. Uninstalling works but is not ideal. Reinstalling will load the settings from the registry as they are not removed during the uninstall, backups will fail. I then stopped the service, deleted the reg key, re-entered the basic settings and started the service. This also works. Then I setup all of our alerts, this also worked. I'm not sure where the problem was but this method fixed it for us.
