we integrated an external app via Installed Packages in Marketing Cloud. The integration adds a new activity in Journey Builder tothe message section where you can find Email as well. Everything works - but for one single user this new activity isn't visible. I checked the permissions, the respective user is admin and has the same permissions as the user users who can see the activity.
Is there anything on Marketing Cloud side which could lead to this problem or is it probably an issue of the integrated app?
Many thanks in advance! :)