I've tried using sms4sats.com several times. Never once has it worked properly without issue. I now use https://temp-number.org instead. It's a little more pricey, but works 99% of the time, so is worth it.
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But you have to create an account! If you have to create an account for something like that it is a complete failure imo. We have Lightning to rebuild these services but without accounts and credit cards. sms4sats.com always worked for me.