Public user accessing REST API call

I am working on IMIS version 20.2.49.5903

I have an IQA in which the access is set to "shared to everyone". I can access the IQA using REST API call when I am logged in as a normal user.

But that doesn't work for public user despite the fact that the '__RequestVerificationToken' is available on the page and the page is viewed using HTTPS.

Is there any setting that I need to do in order to make public user be able to access the IQA through REST API call? Or is it just impossible for me to do that for this version of IMIS?

Thanks.