Was the form shared with the other users? The enabled state of that checkbox is dependent on the subscription level of the form author. Could you please confirm that the form author has a paid subscription?
Yes, I created the form and let others import it as a design file. I have a
paid 20 user subscription license for one year.
Thanks for the clarification. Could you please send an email to email@example.com, providing your Adobe ID (email address) and the ID of one of the other user accounts so that we can investigate this issue?