My shared user can’t see the connection

Hi, I have sent a share request for my mother in law for our security camera. She has set up her own account and received the email requesting her to join the shared location. When clicking on the share link it takes her to her shared manage in the control centre but it is blank. I have deleted the account and reset but still nothing. I did it for my wife and that worked fine but my mother in law’s account has no sign of the shared access request? Thanks in advance Owen