Solved
Does AEM Sites 6.4 support OpenID authentication?
The existing documentation on this topic shows that AEM 6.3 does not support OpenID, but links to a community solution:
Adobe Experience Manager Help | Understanding Authentication support in AEM
However, the community solution has the notice, "This module has been deprecated and retired."
Does anyone have the current state of OpenID support in Sites 6.4?
Regards,
Brent