Not sure if you found a solution, but here's what my problem was.
I was sending the same date for startDate and endDate, which returned a 404. Make sure that you are sending a valid startDate and endDate
Hope this helps somebody else that stumbles across this thread.
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I found the answer. The issue was that I was setting Launch screen interface file base name to LaunchScreen.storyboard. The solution was to remove the extension - I only had to provide LaunchScreen.
Same issue here. I've ensured that I have the appropriate entries in both my iOS app and the widget's info.plist file. It works fine in the app, but I get the same error for the widget. It feels like a bug with WidgetKit, and if necessary, I'm happy to file a bug report.
When can we expect the ability to set the first responder, particularly in iOS and iPadOS? Unfortunately this could be a blocker for me moving to SwiftUI. I haven't found any workaround for this yet.