If you've clicked on your eDrive registration and received an error that says "Oops! We can't verify the token." there are a few options listed for you in the error page.
First check that you haven't already registered for your eDrive account. Once you've registered the registration links in your invitation are no longer valid. If you have already registered then follow the "Have you already registered?" link on the error page to log in (or the link in the Welcome email you received).
If you've not previously registered and you receive this error page then it's possible that your invitation has expired. Please click on the firstname.lastname@example.org link on the error page to email our support team - this will automatically include the relevant information to allow us to support you.