The speaker for one of my sessions can't access editing their bio

In one of my sessions, I added a speaker. I gave her rights to add her bio. However, she is unable to add it. She says that she is getting notified that her email is incorrect. I have checked her email and it is the same one to which she is getting emailed. She said she is trying to access from, again, this same email. I gave her full edit rights to the whole session to see if that would allow her to add her bio, but that still did not fix the issue. Thank you for the help!