ScholarOne Manuscripts Ideas is a community forum for clients to engage with each other and with the ScholarOne Product team around ways to improve the platform experience. Ideas submitted in this forum are useful in surfacing themes and items of critical importance to our users, prioritizing roadmap initiatives, and fine-tuning feature development.
If a preferred reviewer is added before co-authors are added, then the same person who was added as a preferred reviewer can be added as a co-author too if the persons' name is slightly different.
For example, if you add reviewer first with email firstname.lastname@example.org and First Name X, Last Name Y and then go to the author step and try to add the same information for a co-author you would not be able to do so.
However, if you try to enter the email address email@example.com and First Name XZ, Last Name Y, you would be able to add them as a co-author.
It seems that on the Author's step the system is comparing both email address and name and if they all do not match it allows adding a person that is already added as a recommended reviewer.