When trying to create an account through the invitation link sent by the buyer, the  below warning is thrown:

We have noticed that there may already be an Ariba Network account registered by your company. Please review before you create a new account.

To avoid duplicate accounts being created please follow the steps below:

1. Click Review Accounts. From the following screen you can review other accounts that may be relevant to your company.
2. You can view the details of each account by clicking  ^... > View Profile.
3. If you are able to locate the correct account you can click Contact Administrator.
4. Fill in the required fields and click Send Email.
5. This will send an email to the administrator of the account with your contact information so they can contact you.

The administrator will need to add you as a user with the necessary permissions, so you can use that account to login through the invitation.

Alternatively, if none of the accounts shown seem relevant, click Continue Account Creation. The content of the buyer should now appear for you.

An account very similar to other ones that were created in the past is being created. Ariba shows this warning message to try to prevent users from creating duplicate accounts.

SAP Ariba Sourcing
SAP Ariba Supply Chain Collaboration
SAP Business Network