Error messages when setting up Zoho in Outlook

Error messages when setting up Zoho in Outlook

Each time I try to set up any of my user email accounts in outlook, I get the attached error message. 
" [authenticationfailed] Invalid Credentials (failure)"
I am using the exact same password I use to log into webmail, and have tried with each of the email addresses associated with my account, and triple checked the IMAP settings. 

Anyone know what is going wrong?