hello @Diana
thank you for your answers. I changed the credentials with the correct informations. When I test the connections the video is working and I can see the book tab in the courses menu.
Now I still have these issues :
1) The join meeting, the cancel metting button and the picture of the user doesn't show.
2) in the user profile, when the user click on more details, the pop up show 1s and disapear (you can check on this short video https://vimeo.com/371845534 )
video