Symptom
The Aircall Dashboard shows the "You don't have access to this page" error below when installing the Lemlist integration:
Cause
User trying to install the integration does not have the Admin role assigned in Aircall.
The integration built by Lemlist requires it to be set up separately for each user, so a separate Lemlist integration is created in the Aircall Dashboard for each connection. For the installation to work, user must have the Admin role assigned in Aircall otherwise the error above would come up.
Solution
The solution is to assign the Admin role temporarily to allow each user to install the integration and then remove it as explained in this article.