Note: If you haven't received an email from Oculus for Business (do_not_reply@oculus.com or do_notreply@fbworkmail.com), you haven't been invited to join Oculus for Business yet. Please don't proceed with further steps until you receive an email invite from Oculus for Business.
As an Oculus for Business customer you are entitled to a free Essential Plus Workplace account. The only way for you to gain access to your free account is by following the instructions in your welcome email.
If you have any issues or have not received an Oculus for Business setup email, please contact Support.