Iâve been tracking some of these authentication apps for awhile, the most recent and most active effort i can find for bringing openid connect 1.0 to nextcloud is this fork of the owncloud openid app.
The text of the readme has been modified to say ânextcloudâ in most cases, but the title shows its an âowncloudâ app.
I canât speak to its functionality, but the repo maintainer is quite active recently.