My Cloud EX2 Ultra OS5 - Local user works but Mycloud invitation: Refused

Hi, I own a My Cloud EX2 Ultra.
Only 2 users, me and Account2. Mine works ok, I’m the admin of mycloud too.
Account2 works ok locally but when I send her the invitation to join mycloud in our NAS it says that the owner has refused her to join. I have no notification, I can’t answer anything, moreover I am the one who invited her!
When I login with Account2 it says that there is no NAS associated
How can I fix this?

Hi @indyjones83,

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting:
https://support-en.wd.com/app/ask