I can not add users

Re: Hello , I get the error "This user is not allowed to add in Zoho. Please contact support@zohomail.com for further details" whenever i try to create a user..

less than a minute ago

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Hello , I get the error "This user is not allowed to add in Zoho. Please contact support@zohomail.com for further details" whenever i try to create a user..pls help