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The error is:
“A required Metadata item with key “ApplicationObjectId” was not found in the TechnicalProfile with id …”
But there is no “ApplicationObjectId” or reference anywhere in my policies?
After some research, I figured it out.
This error occurs when using an extension attribute in your custom policy.
The error tells you that you haven’t included the custom policy support for this.
This is documented here.
You need to add the technical profile below to your extensions file:
Azure Active Directory
<!--Insert b2c-extensions-app application ID here, for example:
00001111-aaaa-2222-bbbb-3333cccc4444-->
<!--Insert b2c-extensions-app application ObjectId here, for example:
aaaaaaaa-0000-1111-2222-bbbbbbbbbbbb-->
All good!
Another strange Azure AD B2C error was originally published in The new control plane on Medium, where people are continuing the conversation by highlighting and responding to this story.