I am trying to register a new user, but the registration fails. Why?

If you, a shipper admin, are trying to register a new user for your shipper company, but receive the following error: “The registration failed for an unknown reason, please try again later”,  this most likely means the email address is already registered on the PRISMA platform. To resolve this, register the new user with an email address that is not already in use on PRISMA.