Hello, I had problems sharing a form. After creating it, I sent it to 4 people, including myself, who managed to open it on Safari. The second person, however, can't open it on Safari or on other browsers in general. The third person tried to open it on her PC but received a 404 error message, in her case I don't know which browser she was using. And the fourth person managed to open it on their Android phone.
Airtable has changed the links for forms. Make sure you have sent everybody the newest link. Go into your Airtable base, disable sharing of the form, re-enable sharing of the form, and grab the newest link.