Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Hello *Everyone!*  I want to implement office 365 sso in my application using Ory hydra. I am stuck in how to implement it.

Hello <@U05KXF09GUQ>
For that I would recommend to use Ory Identities/Kratos, read more here <https://www.ory.sh/docs/kratos/social-signin/microsoft>

how can implement it in self hosted service?

In the same way for self-hosted, you just edit the config directly, host the jsonnet somewhere and restart the server:
<https://www.ory.sh/docs/self-hosted/kratos/configuration/oidc>