adding user via customer portal

adding user via customer portal

hi

add user via customer portal
all good

but when i use zoho creator mobile - system writes there is no such user
and via creator.zoho.com is it possible to register user with same email address
when in next step i register user via creator.zoho.com - system allows user to login to zoho creator mobile

how can i mass register users (via customer portal?) so that it will possible to login to zoho creator mobile after registration?