Use these resources to troubleshoot the common issues you may face in Zoho One. Each article will have a description of when you may face the issue, the reason for it's occurrence, and the possible measures you can take to resolve it. If you are still unable to resolve the issue, contact support@zohoone.com for further assistance.

Section	Errors
User management	Email address is already used The domain which you have entered belongs to another deployment/region You are trying to activate more users than the allowed license limit of 'n' users This email address is already registered with another Zoho account Unable to deactivate user in Books Unable to deactivate user in Backstage At least one administrator is required in {app name}
Organization	JPG files with CMYK color profiles cannot be uploaded
Security	Policy must be used by at least one group. Apply policy to another group and try again.
AD Sync	Cannot sign in to AD Sync Tool