Problem with the "Add to CRM" button on zoho mail on CRM

Problem with the "Add to CRM" button on zoho mail on CRM

Hello, 
I have a little problem. The "add to CRM" button in the setup of Zoho Mail on my CRM doesn't work. Instead, I can see the mails of my customer on their personnal file which is really a problem for me. 
I don't understand why because it worked before ! 
Now the Mails in each customer personnal file dont update ! 
How can i fix that ? 
Thank you, 
Clément