A very small set of customers experienced failures loading the Azure AD B2C settings menu in the Azure portal intermittently. This issue did not impact end-users authenticating against Azure Active Directory B2C. As a temporary workaround, administrators should load the settings menu in a different browser or using the Private mode. As per our investigation, the issue may be occurring more often in the Edge browser than others.
We apologize for the inconvenience and are investigating the issue actively. If you have any additional insights/repro, please communicate with us on AADB2CPreview@microsoft.com.
6/19 update: The issue has been mitigated as of 6/18 11PM PST.