B2C issue text messages not delivered

Question

B2C issue text messages not delivered

Ashley Milne 0

HI we have an issue with a B2C wth second factor authentication telephone numbers in Guana not being accepted can you verify Microstofts stance on this?

Shubham Sharma 12,525 Reputation points Microsoft External Staff Moderator

2026-04-08T09:25:16.8633333+00:00

Ashley Milne

Thank you for reaching out to Microsoft Q&A.

I understand you're experiencing B2C text messages not delivered issues, to resolve this we need to engage with our engineering team.

Could you please send your requested details via private message so we can further assist?

This information will help us investigate the issue further.

Thanks
Alex Burlachenko 19,850 Reputation points MVP Volunteer Moderator

2026-04-09T09:43:35.91+00:00
Ashley Milne hi and thx for join us at q&a,

yeah this is not a bug, its regional SMS limitation. Entra ID B2C uses Microsoft SMS providers behind the scenes and not all countries are fully supported for MFA SMS. Ghana is one of those “partial / unreliable” regions so u get

messages not delivered

numbers rejected

inconsistent behavior

its not something u can fix in config tbh. if u are interested it happens coz

telecom restrictions

carrier filtering

Microsoft providers not having stable routes there

I reccomend use something else for MFA, like

authenticator app

email OTP

or custom SMS via external provider (Twilio etc via custom policies)

if u stay on built-in SMS u will keep getting random failures in those regions

rgds,

Alex