Ask HN: Anyone have advice on 10DLC registration?

Hello, I'm setting up a service that uses text messages for something like 2FA: it sends a text message containing a code back to a person.

However I apparently have to go through this 10DLC campaign registration process [1] because right now the number is outright blocked by many carriers. It's odd though because 10DLC seems to be strongly oriented to marketing uses for texting, which I'm not doing.

Anyway, getting to specifics: For "Campaign and content attributes" I think NONE of the options apply, but I'm also worried that I will be rejected if I don't include "opt-in" and "opt-out" keywords and text.

I've checked 2FA messages still on my phone from various big corps and they don't include opt-in/out text. But they are huge and I'm a tiny unknown; would it simply be on safer side for me to include opt-in/out in the application, just to reduce the chance of rejection?

Appreciate any help, thanks!

[1] https://support.telnyx.com/en/articles/6339152-how-to-create-a-10dlc-campaign