Chrome 80 will come soon. Chrome 79 (beta) seems to already block third party cookie without SameSite = None. https://blog.chromium.org/2019/10/developers-get-ready-for-new.html
Play 2.7 branch has already supported by https://github.com/playframework/playframework/issues/9612
However, including the commit is not released yet on Play 2.7.
I’d like to test and release for our service including the fixed version.