this is rare known issues. To fix this on you side try to reload the ESET MSP Administrator portal without cache (Ctrl+F5). If this does not work, please follow this:
Login to ESET MSP Administrator
Go to Applications > Local Storage > https://msp.eset.com
Delete the key PendingRequests
Reload the ESET MSP Administrator portal (Ctrl+F5)
If this still does not work, please contact ESET Technical Support.