Thank you for posting this in Microsoft Q&A.
Yes, you are correct. Currently, Entra External ID supports two MFA options: SMS and Email.
I would like to request you to please share your feedback on our feedback channel https://feedback.azure.com/d365community/forum/22920db1-ad25-ec11-b6e6-000d3a4f0789Which would be open for the user community to upvote & comment on. This allows our product teams to effectively prioritize your request against our existing feature backlog and gives insight into the potential impact of implementing the suggested feature.
As of now, we cannot share any information on the availability of this feature.
I recommend keeping an eye on the monthly updates at https://zcusa.951200.xyz/en-us/entra/external-id/customers/whats-new-docs for the latest information on external tenants.
Hope this helps. Do let us know if you any further queries.
Thanks,
Navya.
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