In the past I have problems with others services(no btc related) with this SMS thing and well, I'll skip GA for now...
Not quite. They're saying the issue arose from a problem with the provider of their SMS provider.
Anyway, @OP, glad this was resolved, though their support response is quite lacking. lol. Good thing you managed to find them at github.
* Oh, they've also advised to enable multiple 2fa options. (This is the reason I'm quite hesitant relying on SMS as 2fa. Unreliable.