3rd party cookie does not work in iOS 13.3 beta.
it's unable to write 3rd party cookie in iframe.
Safari setting "Block All Cookies" AND "Prevent Cross-site tracking" are turned off.
it works in iOS 13.2.2 (official release).
3rd party cookie does not work in iOS 13.3 beta
We have the same issue, hoping 13.3 beta 3 fixes this. We are loading local html files and making API requests to a secure server and the cookies aren't sent, works in 11.0 through 13.2.3
Seems the issue is still persistent in 13.3 Beta 3 and 3rd party cookies are still blocked besides “Block all Cookies” turned off and “Prevent cross-site Tracking” turned off. Filed a bug with Apple as this prevents several websites that cross connect for login purposes from being usable in iOS and iPadOS. Problem also persists in Chrome as it seems they use the same WebKit.
This is also a real problem for our site, which needs to work with Chrome. Website A needs to know how the user is logged in on Website B, which requires third-party cookies..