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It seems, your issue is related to the SameSite issue. Please refer the below links.
https://github.com/magento/magento2/issues/26377
https://support.magento.com/hc/en-us/articles/360049032952-Customers-get-logged-out-or-lose-cart-content-on-Magento-storefront
Solution:
To solve the issue, contact the third-party service provider and request their ...
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