Users not receiving B2C verification code email

Question

From time to time we get users reporting that they have not received the verification code email so that they can reset their password. More often than not the email ends up in their spam folder or corporate filtering prevents them from receiving it. However, we do get users who are adamant that it's not in their spam folder and it's not being filtered out, and we've been getting a higher than usual number of complaints recently.

Is there anyway we can check to see if the verification emails have failed to send and why they have failed, or can I add something into Application Insights to log this?

Answer 1

I am a user having this trouble with a service which appears to use Microsoft B2C. I have been having the trouble for many months, at least since the time of the OP. I have checked spam and ensured there are no custom filter rules which are deleting or otherwise hiding the emails. This is not the only service I have verification code problems with. I suspect these others might use Microsoft B2C as well.

The email account I have difficulties with includes "spam@" in the user name. Is it possible that B2C is filtering out verification codes to emails with "spam@" in the name? This email account in question is a gmail.com account. Gmail allows users to insert or remove arbitrary '.' from the email address. For instance, the following email addresses all end up in the same gmail account. "abc.spam@Stuff .com", "a.b.c.spam@Stuff .com", "abcs.pam@Stuff .com". These are not my real email addresses, it is just an example. I performed the following test.

Preexisting account with email "abc.spam@Stuff .com", not getting verification codes
Sign up for new account with "ab.cspam@Stuff .com", no verification code
Sign up for new account with "abcs.pam@Stuff .com", received verification code.

This makes me think the problem is on the B2C side. I would love to get this issue resolved as it's been a huge inconvenience for me.

I am inferring the service in question uses Microsoft B2C because the reset code url is "https://login.someservice.com/someserviceb2c.onmicrosoft.com/b2c_1a_webapp_signup/oauth2/v2.0/authorize...."

Answer 2

Hi @Neil B , from what I've seen this could be an ISP related issue. Most likely we'll need to open a support ticket. Do you need a free support request?