Setting cookie in iframe – different Domain

Since your content is being loaded into an iframe from a remote domain, it is classed as a third-party cookie.

The vast majority of third-party cookies are provided by advertisers (these are usually marked as tracking cookies by anti-malware software) and many people consider them to be an invasion of privacy. Consequently, most browsers offer a facility to block third-party cookies, which is probably the cause of the issue you are encountering.

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