Does FusionAuth support MSAL or ADAL
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With respect to Office 365 integrations, does FusionAuth support either of these?
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FusionAuth does not use either ADAL or MSAL directly. What FusionAuth does allow for is integration using OIDC, SAML, or custom logic with a connector. Essentially, FusionAuth can act as the Service Provider deferring authentication decisions to an external source via these protocols.
It appears that MSAL integrates with the OIDC specification, based on a quick read of their documentation, so you may want to consider using an OIDC Identity provider here.
https://fusionauth.io/docs/v1/tech/apis/identity-providers/
Another option is to use connectors. With connectors, you can write your own custom integration logic to validate auth against an external source (be it MSAL, ADAL, or something else). Our documentation here covers examples and some of the differences from an Identity Provider.