Multiselect not working unless someone is logged in

On my site, a non-logged in user creates a “quote request” via a form. There is a many-to-many relationship between “vendors” and “quote requests”. However, it is my understanding that you cannot have a many-to-many multiselect in a form.
So I created another screen with a multiselect that is set up to Update the current quote request.
This has been working but I need to be logged-in. If i am not logged in, then I get a “action cannot be completed” and the selected vendors are not added to the current quote request.

Is there something I can do to make sure this works since nearly all of my users will visit my site and request a quote without ever logging in.

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