I read this https://help.miro.com/hc/en-us/articles/360017730373-Free-Plan
And I understand that there is no limit to invite team members.
But I want to know if there is limit for sharing Board.
It seem that there is, or not working with manage access screen in board share function.
Thank you.
Answered
Difference between invitation for Team member and sharing Board in free plan
Best answer by Kiron Bondale
Yes, there is a limitation for free plan users on being able to use the public guest editor sharing capability (see below):

Reply
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.