Unable to add user to Adobe Express?

Hi, 

Thank you for reaching out to us about this. Could you please provide more details? Are you trying to add a user to a document or a project? 

If you are trying to add a user to a document for collaboration, you can add them from the "Share" option on the document editor page. 

Kindly let me know if this helps resolve your issue. 

Regards, 

Rajesh