When using Gmail can't launch Zoho

When using Gmail can't launch Zoho

When you are in Gmail, you can click on the "More" button and launch Zoho. I used to be able to do this but now I get a message: you do not have access. Contact your administrator.  I am the administrator but I can't figure out how to fix this. Now the only way I can login to Zoho is by navigating to the www.crm.zoho.com website.