I had a similar problem. There is a temporary solution (it will not work if you intend to monitor user behavior on sites).
I am. Place a Persian persistent cookie in the domain where your iframe will be placed. (This can be done using JavaScript).
II. Insert an iframe dynamically and pass the cookie value to your website.
III. If you intend to monitor user behavior on different sites, change the code above to use third-party cookies when the browser permits, otherwise you can use the above approach.
I have not come across any other way around this. If you find a more acceptable solution, let me know.
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