Sign in to your Zoho Mail account and tap on the gear in the upper-right corner to open the Settings tab.
Now select Mail Accounts from the list showing on left pane of your account screen
Next, select IMAP Access option from the right section of your email account screen
Finally click on Save button to save the changes.
Login to your Zoho and click on Security option.
Now click on App Passwords option.
Enter your Zoho Mail account password and press Confirm Password button.
Click on Generate New Password button to generate App specific password.
You are now prompted you to enter App/service name where you want to use Zoho Mail App Password. Enter the name App name and hit Generate button.
An app password is created successfully, hit on Close button.