The Owner and the Administrators can create and share access. To do so, in the app, go to Manage Access then New Kit and New Keys. This new access key can be access via the app, a badge or a code. This access can be shared by email or SMS. Sharing the code is done at your convenience.
You can also add a Badge to a Trousseau via the Somfy Keys app. For this, go to Manage Access, New Kit and then New Keys. Select Badges and enter the references on the Badge into the app.