Is anyone else experiencing an inability of iPhone to sync with Yahoo Calendar starting today?

Starting today my iPhone will not sync with my Yahoo Calendar. Yahoo mail is working fine. I tried toggling Yahoo calendar off and on, and then tried deleting my Yahoo account from my iPhone and re-adding it. Nothing is working. There’s a little red exclamation mark in a circle next to “calendars” in bottom row when viewing my Calendar app, and when I touch that to open Calendar selection there’s a yellow warning ⚠️ sign and it says “unable to connect to account.”