Hi @Aveeva
Replace the code below in line no. 41 in app/code/core/Mage/Core/Model/Cookie.php
const SAMESITE = ';samesite=None; Secure';
Replace the code below in line no. 37 in app/design/frontend/base/default/template/page/js/cookie.phtml
Mage.Cookies.path = '<?php echo Mage::helper('core')->jsQuoteEscape($this->getPath()) ?>;samesite=None; Secure';
I think that is enough for samesite cookie. No need to do more amendments in the other file if you did not enable page cache.
If the issue is because of samesite cookie attribute then the issue should be fixed with this changes.
Hope this helps you!
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