document.cookie doesn't work on

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Hi Everyone -

I'm working to add a third party integration (JS library + div) to my site, up until about 2 weeks ago things were fine widget was opening the iframe as expected. However now when I click the CTA widget I get this error in the console "tfc-l was unintentionally deleted." tfc-l is a first party cookie, they are trying to write to the browser. It looks like document.cookie doesn't work on, did something change?