[Denkel]

If you read Microsoft's response, they point at the companies issuing the MFA because -according to MSFT- "the companies are not entering the issuer in the label" and MSFT expect the issuer to be there.

I would imagine that, if that is their expectation, they would include the issuer in the label themselves, so, none of its products should have any issue.

The problem comes from using other provides -that use the "issuer" field to store the issuer (how quirky of them, amirite?)- while having the same email as identifier.