Azure AD B2C issuer claim support

Azure AD B2C policies can be customized to emit issuer claim in two formats: https://<domain>/<tenant>/v2.0/ and https://<domain>/tfp/<tenant>/<userFlow>/v2.0/. Microsoft Identity Web follows the guidance from Azure AD B2C team and only supports an issuer in https://<domain>/<tenant>/v2.0/ format.

Editing Azure AD B2C user flow

1. In the menu of the Azure AD B2C tenant overview page, select User flows, and then select the desired user flow.
2. On the user flow page, under Settings, select Properties.
3. Under Token compatibility settings, set Issuer (iss) claim to https://<domain>/<tenant>/v2.0/ format.