Microsoft Form in Sharepoint site for people outside of organisation

We have a form where customers can log a ticket and it is loaded into a SharePoint list. One of the questions on the form is an attachment field where users can upload necessary files. With this field, it means the form can only be filled out by those within your organisation. This form will be loaded onto our SharePoint site.

Now the way our SharePoint site is set up is that we have some people with shared access to the site meaning they use their own emails to access our SharePoint site. If they have access to the SharePoint site, will they have access to our form as well? We want a form that anyone can access if they have access to our SharePoint site.