In the case that a vendor company does not appear to be on Octerra, they may not be a part of your preferred list of vendors and may need to be invited to create an account.
To learn how to invite a vendor company, check out the following article:
How do I invite vendors to collaborate on a project?
If you are unable to invite a vendor, please contact Technical Support.
In the case that a specific user does not appear to be recognized by Octerra, it may be because the user does not have an account or the account was deactivated. The following article contains information about inviting a new vendor user,
How do I invite vendors to collaborate on a project?
If you receive an error that says the user is already registered, please contact Technical Support.