I can't remember the details, but the only problem I ever encountered regarding 2FA was with twitter around Christmas. Either their system was screwy, or I was labelled as a Russian bot or what. But I had to authenticate myself, but just never received a code via text. Again and again. No explanation why, getting through to a human in customer support was hell.
Eventually I did get a response by creating a new account on a device that had never been used to access twitter by me or anyone, and from a VPN to mask my IP.
Really frustrating, and yes, yes, we all know Twitter is garbage, but it gave me pause regarding 2FA - What if it were, say, my gmail account? I'd be f'd.
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