Your Priorities is a digital democracy platform, a progressive web app, and a participatory social network that empowers groups of any size to speak with one voice and organize around ideas. - https://yrpri.org/
Is it LDAP compatible?
No idea, but have asked them on Twitter:
They have responded:
No, not at the moment, but the open source code uses Passport and there is a LDAP module here that would be trivial to add: https://www.npmjs.com/package/