This is the answer, more detail: https://docs.microsoft.com/en-us/azure/active-directory/authentication/concept-mfa-howitworks. Source: about 2 years ago

Make sure that you back-up the active app-configuration, this way you have an easier way to recover; make sure you are allowed to verify using more than an authenticator, more here. Source: about 3 years ago

I added cloudflare-dns.com as a static entry and cleared cache. Cleared cache on my machine and pinged google.com. There were 2 DNS requests against both dynamic servers. I then pinged yahoo.com and 2 more DNS requests were created. I have not looked in Wireshark to see if the DNS requests are requests to the destination URL or if it's to cloudflare-dns.com. However, the fact that I have cloudflare-dns.com defined... Source: 12 months ago

I'm having an issue with cloudflare DoH (using cloudflare-dns.com) not working since tuesday on Android. As you can see in this post, it doesn't affect only me. Source: about 1 year ago

I know but DoH with cloudflare-dns.com isn't working so I mentioned an alternative that is working that still uses cloudflare, albeit DoT. Source: about 1 year ago

I am using cloudflare as DoH method on my phone (s22, Android13) with the following URL : cloudflare-dns.com . It was working well until earlier today, when it stoped working, and nothing I tried fixes it. Other DNS providers work, and cloudflare DoT works... Source: about 1 year ago

I've been using cloudflare-dns.com for quite a while and noticed today that it stopped working on my Pixel 7 Pro. Switched it to one.one.one.one and it started working again. So far, so good. Source: about 1 year ago