Thanks for the details — please go to Syndication > Diagnostics and check what it shows for one of those feeds, and also verify the student site feed opens correctly in a browser/feed validator. If the feed URL changed to https or needs authentication, FeedWordPress will find it but skip the posts.
Thanks for the response, @kstmonowar. The student’s website and their feed both open properly in my browser. Here’s what I get when I run the Diagnostics on one of the students’ feeds:
Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in /home/briancr1/public_html/f26dh/wp-content/plugins/feedwordpress/diagnostics-page.php:95 Stack trace: #0 /home/briancr1/public_html/f26dh/wp-content/plugins/feedwordpress/diagnostics-page.php(95): in_array('email', NULL) #1 /home/briancr1/public_html/f26dh/wp-content/plugins/feedwordpress/diagnostics-page.php(28): FeedWordPressDiagnosticsPage->accept_POST() #2 /home/briancr1/public_html/f26dh/wp-content/plugins/feedwordpress/diagnostics-page.php(495): FeedWordPressDiagnosticsPage->display() #3 /home/briancr1/public_html/f26dh/wp-admin/admin.php(298): include('/home/briancr1/...') #4 {main} thrown in /home/briancr1/public_html/f26dh/wp-content/plugins/feedwordpress/diagnostics-page.php on line 95
So that’s obviously an error of some sort, but I’m uncertain how to correct it.