If you have multiple eHerkenningmiddelen (linked to different e-mail addresses), it is not possible to merge them. However, you can add a additional authorization to the eHerkenning you wish to maintain.
You can do this by following the steps below:
1. Log in to My Reconi
2. Click on "My Account" and then on "My Authorizations"
3. Then click on "Request Additional Organization/Authorizations".
4. Determine your authorization n.a.v. KVK extract
5. From the dropdown menu under "Organization", select "I want to request for another organization."
6. Continue with the remaining steps.
The eHerkenning which you then no longer need will automatically expire when the validity period expires.