Autofill sms/email not working SOME websites

Is there anyone with SMS/ email autofill experience who can chime in?

I have TWO major known websites Safari autofill does not work. Any other website I use, it WORKS.

I’ve used autofill for years. In the last two weeks, the SMS and email stopped working for 1) usps.com (neither sms nor email works). This is regardless of device - happens phone, or desktop. I have been a customer for over 15 yrs, and before it worked as expected. I thought it was just them. But today, I have the same issue with a second site, oddly, 2) WSJ (sms)

I do get the email or sms in BOTH cases, but **Safari doesn’t autofill**. In both cases it DOES autofill my UN and PW - it is just the SMS and email not populating. The code never appears in the browser - I have to go get it from text or email. My devices are up to date. I have toggled off/ restarted/ toggled on with no change. I have other websites the sms autofill works fine.

Where do I go from here? Does two sites that don’t work (recently) with autofill, constitute a problem at this point when it IS working elsewhere just fine??

thank you in advance