Microsoft authenticator push notification on Ipv6 not working

Question

Hi folks

My ISP recently upgraded router to use Ipv6 and since then Microsoft authenticator push notification stopped working on my phone. It just keep rotating for a while until time out.

However when i switch to mobile data which is on ipv4, it works fine.

I can't disable ipv6 on my phone when connected to wifi.

Answer 1

Hi @NITIN GUPTA

Your test with mobile data points to the cause: the phone is fine, but the new router's IPv6 setup is most likely blocking the push notification service your phone uses (Apple's or Google's, not Microsoft's). That's why the request spins and times out on Wi-Fi only.

You can still sign in right away, because verification codes don't need the internet:

1. When the sign-in waits for approval, choose Sign in another way (or I can't use my Microsoft Authenticator app right now).
2. Pick Use a verification code.
3. Open Authenticator, tap the account, and type the 6-digit code it shows.

To fix the notifications themselves, the change has to happen on the router, since you can't turn off IPv6 on the phone:

• Update the router's firmware and restart it, in case your ISP has already released a fix.
• Look in the router's IPv6 firewall settings for an option that blocks outgoing or "unsolicited" traffic, and set it to the default or standard level.
• Ask your ISP about it if neither helps. Tell them push notifications fail on Wi-Fi but work on mobile data, so they can check their IPv6 routing. Some routers also let you turn IPv6 off for the whole network as a temporary fix.

Is your phone an iPhone or Android, and do other apps' notifications (WhatsApp, email) arrive normally on that Wi-Fi?

If the code sign-in or a router change sorts it out, please consider accepting it as the answer. If notifications still fail after the router update, let me know and I'll be happy to keep helping.

Reference:

• https://support.microsoft.com/en-us/authenticator/microsoft-authenticator-faqs