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Note that Twilio numbers (in the US, anyway) cannot receive SMS messages from short codes [1]. This means that you may not be able to receive SMS 2FA messages from your bank.

[1] https://support.twilio.com/hc/en-us/articles/223181668-Can-T...

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Is there any reason why twilio can't start supporting them?

Probably for the same reason twilio don't allow you to set your CNAM entries. Banks and PayPal use it for KYC and such...

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