Kindly cross-check and ensure you are entering the correct verification code as mentioned in the invitation email. Enter the code manually rather than copy-pasting the same. 

Also, do not copy-paste the assessment URL from any other browsers to the Google Chrome browser to access the assessment. Right-click on the link given in the invitation email and select the option 'Open in chrome browser' or 'Copy the link address and paste it in chrome browser.

In case the issue persists, please reach us out to our support number +918067414716. Also, raise a ticket with the screenshot of the error. Click here to raise a ticket.