How to see addresses I've marked as junk

Note that I'm not talking about a junk folder on my phone, I'm talking about the AT&T email client via the web, aka the spam folder

If you've blocked senders and want to delete the block, click the Settings gear in the upper right side of the browser window.  Then click More settings in the menu.  Finally, click Security and Privacy to display the Blocked Address section where you can delete the ones you want.

I looked at that.  Over time I've noted plenty of emails as spam so there should be plenty of domains showing up.  But like your screenshot, I have zero noted.  How can I see all the domains I've already noted?

Ahh, ok, I misunderstood.  When you mark an email as spam that doesn't put the domain in the blocked list.  It (supposedly) tells Yahoo that you think it's spam. Then Yahoo (supposedly) uses AI (or tea leaves or a Magic 8 Ball) to look at those and determine if they need to be blocked for everyone.

There's no way for you to get a list of the ones you've marked.  As you can see from my remarks, I'm not even sure that Yahoo actually does anything with those marked emails since I know I've marked a lot of emails that were clearly spam over the years and they still come through.