New Collaborator Cannot Create a New Account - error message says email address is not valid

Hi ​@Diveregent Financial, 

Welcome to Box Community, and we’re glad to assist! 

For us to help you review this error message, I’ve gone ahead and created a support case. Please keep an eye out and a member from the Box Product Support team will reach out through email. 

Thanks for posting, and we hope to sort this out soon!