How to verify publisher for Azure AD B2C app

Saxon Druce 0 Reputation points

I have an AD B2C app on a separate directory / tenant from my corporate tenant, which I am using in a custom policy to enable external users to sign in.

However, when signing in the user is prompted that the app is unverified:


How do I verify the application's publisher?

I have posted a question to stack overflow here with more details on how my app is configured:

When trying to verify the publisher, I get the following error:

    "error": {
        "code": "MPNAccountNotFoundOrNoAccess",
        "message": "The MPN ID you provided (1234567) does not exist, or you do not have access to it. Please provide a valid MPN ID and try again.",
        "innerError": {
            "date": "2023-05-22T05:40:35",
            "request-id": "539cdf4d-a6cf-415b-a7ea-6fe020332043",
            "client-request-id": "de0016fc-bc14-4780-8391-da6d4d937bf9"

The suggested remediation for this error at says to ensure that the tenant the app is registered in is associated with the MPN account, but this does not seem to be possible.

What steps am I missing here, to be able to verify the app publisher?


Azure Active Directory
Azure Active Directory
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