Yes, you can add unlimited organizations to an existing eHerkenning.

Follow the steps below to add an additional organization to an existing eHerkenning:

1. Log in to My Reconi
2. Click on "My Account" and then "My Details."
3. At the bottom of the page, click "Add Additional Organization/Authorities."
4. At the bottom of the page, click on "Request Additional Organization/Authorizations."
5. Choose "I want to apply for another organization" and enter the corresponding Chamber of Commerce number.
6. Click "Next" and complete the application.