Unable to reset Windows Hello for Business PIN

Recently I have been troubleshooting a nasty Windows Hello for Business problem which prevented all users in a tenant from resetting their Windows Hello for Business PIN’s on Azure AD joined devices while getting the error CAA20004. Issue When clicking on “I forgot my PIN”: After completing the account sign-in and MFA challenge the Error CAA20004 came up: Troubleshooting The Azure AD Portal shows us “Failure reason: other”. While recording all the https traffic to Microsofts oauth2 endpoint with Fiddler this finally unveils usable information

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Unable to reset Windows Hello for Business PIN

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Unable to reset Windows Hello for Business PIN

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Unable to reset Windows Hello for Business PIN

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