It doesn't matter if the flag "Automatically activate..." is checked or not.
Could you, please, esplain the error ?
Thank you ,
Luigi
First of all apologies for the late reply.
The error might arises when you are trying add user in RMP but he had already trial account with same user email id. Can you please check.
Please don't hesitate to contact us for any further query.
Best regards,
RunMyProcess Support Team