Problem with push mail

K-9 6.602, Samsung S21+, Android 13. I am having a problem with push mail. I have Inbox, drafts, sent and trash set up as 1st Class folders and poll set to 15 minutes, 1st class folders only. When I set up poll to poll 1st class only folders, the app immediately closes when it tries to poll. I’ll continue investigating locally to see if I can find a reason.

Another and far more minor issue is that the widget won’t appear on the home page when I set it up.

What am I doing wrong?