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Supply chain | Supply Chain Management, Commerce
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B2C authentication with a "Custom Policy"

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We have an existing external identity provider service that is connected to the same B2C /Application Registration/ that Commerce is configured against.  As this external authentication uses SAML, it had to be configured using a /Custom Policy/ within Azure's /Identity Experience Framework/ (rather than a standard /User Flow/.  This flow works as intended when tested from a test application, e.g:  Test App -> B2C (Via SAML) -> External Identity Serivce -> Back to B2C -> Back to Test App.  ...But Dynamics/Commerce throws a 500 when the custom policy name is entered into the /Signup signin policy ID/ field within Commerce.
 
Are Custom Policy user flows even supported within Commerce?  Where can I see additional Commerce logs, detailing exactly which part of the Custom Policy it's erroring on?
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