SSO requires SameSite cookies to be set to 'None'

[r-a-y]

This is a core WordPress issue, But I'm posting about this here for those having a problem with Mercator and SSO.

For a workaround, you can use the following mu-plugin: https://github.com/MikhailRoot/samesite-cookie-manager.

You'll need to log out and log back in again to test.