Hi ​@Christine Khoo, thanks for reaching out! Was this board originally stored in a Free plan before you tried upgrading? If so, it’s possible the content was removed due to team inactivity. As outlined in our Help Center, if there’s no activity in a Miro Free team for 12 months, we’ll notify you by email. You then have 90 days after the first reminder to log in and open a board before the team and its content are permanently deleted.

I’d recommend double-checking your email for any such notifications and also confirming whether you still see the team in your dashboard.