iPhone 13 Won’t Receive Verification Texts? Here’s the Answer.

My iphone 13 (v 16.4.1) also had "filter unknown senders" enabled, was fine till just today (May 18, 2023) when it suddenly stopped allowing verification texts through. I tried from my laptop, no go. Tried from different browsers, nothing. Tried initiating a phone call for the one-time-passcode, nada. Nothing was getting through. This was all for my Amazon account. I worried that my credit card was being hacked via Amazon, so I tried logging in there. One-time-passcode was initiated. Nothing to my phone. I decided to look in my message app and noticed the setting was on (I don't remember enabling it, but that doesn't mean anything, especially considering the ridiculous 16.4.1 security updates I'm STILL figuring out). I disabled it, successfully received a one time passcode from my credit card company, then re-enabled it after checking my account. I do NOT appreciate the sudden blocking of validation codes that had previously worked. I did NOT touch any settings. You are not crazy either - iPhone users are getting jerked around somehow. Communication about this would be great at alleviating frustration.