Azure B2C Verfication Codes Not Received In User Emails

John McRae (Secretary) 25

We have launched an app that use Azure B2C for user management. However users with an email relating to bigpond.com or bigpond.net .au do not receive the verification code sent by Azure B2C sign up. Given that most users do get the verification code, I can only assume that Azure is sending the emails and Bigpond is blocking them. This is a showstopper for bigpond users as they cannot sign up.

What's the next step given that we can't seen the exact email that was sent? How can I go to Bigpond and without and example of a blocked email?

Ben Fissioli 15 Reputation points

2023-11-14T08:50:55.3066667+00:00

We are also getting the same issue with bigpond.com accounts. FYI iinet.net.au accounts also appear to be having issues with MFA emails being delivered.
James Patterson 5 Reputation points

2023-11-14T23:52:25.6933333+00:00

Exact same issue here, although in our case it is the "forgot password" email verification that is not working (we don't allow sign up in our flow). We have also seen possible occurrences of this with internode and tpg accounts. So it appears to affect a few other ISPs as well.
James Patterson 5 Reputation points

2023-11-17T05:46:42.8133333+00:00

When logging an azure support ticket I had this message pop up. This might be relevant, I am not sure. Has anyone else with this issue noticed that is has stopped occurring over the last few days?

Resolved: An Azure service issue (Tracking ID JKZG-HSZ) impacted resources in your subscription.

Impact Statement: Between 12:00 UTC on 4 November 2023 and 22:33 UTC on 14 November 2023, you were identified among a subset of customers using Azure Active Directory B2C that may have seen delays or a lack of system-generated emails from Microsoft for Self-Service Credential Management scenarios. We identified that this issue was a result of the email length limit on customer email servers preventing email delivery for emails containing a large number of characters.
Ben Fissioli 15 Reputation points

2023-11-17T05:56:55.6066667+00:00
Hey John, didn't see this message when logging a support ticket a few days ago but we've just received an email late yesterday from Microsoft Azure support team stating\asking the following:

"We have checked the issue and consulted with our product group. According to product group’s investigation, this is a known issue and being repaired. Please check below findings:

If users received the blank/illegible OTP emails, you could increase email length limit on your email servers.

If users cannot receive the OTP emails at all, please let us know, and please provide the latest 48 hours of captured audit logs for further investigation."

Haven't received an update from Microsoft that it's working yet, but my colleagues are testing atm and the issue appears to have been resolved.

Cheers

Ben
John McRae (Secretary) 25 Reputation points

2023-11-22T04:27:46.83+00:00

Thanks Ben and James, I have also found issues with iinet, netspace and tpg. I have been working around the issue by manually creating B2C accounts but that's not ideal of course. I'll do some testing to see if the issue has been resolved.
John McRae (Secretary) 25 Reputation points

2023-12-12T02:15:05.35+00:00

All emails that had problems are working now.

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Azure B2C Verfication Codes Not Received In User Emails

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