Have you tried to clear your browser cache and cookies? Doing this will solve many website issues as many church web pages have changed over the past three months. An HTTP 400 Bad Request and a 431Request Header Fields Too Large error may result when websites change but locally stored data does not get updated. When I have issues with a website I first do a
hard webpage refresh since it is the quickest and easiest first step in attempting to resolve web page issues. If a hard refresh does not work then clearing cache and cookies is the next step. Make sure not to check any options for clear stored passwords as this is not necessary for this issue and only creates more work later on.