This article explains what to fill out in the "Domain" field on the L1NDA app.
Every L1NDA client has his own website. You have to add this into the app in order to make this work properly. In case you do not know your company web-link by heart, you can find this once you are logged into your L1NDA account.
To make this more clear: take what is noted before ".l1nda.nl" Please see the picture below.