Thanks @thinktapwork. Your comment helped me find what was going on for us.
The Intent Definition file needs to be added to both your Intents & Widget targets, but then you end up with duplicate generated classes.
The only combination that seemed to work was to change the "Target Membership" code gen settings to "Private Intent Classes" for all included targets.
siburb2
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Thanks @edford, that seems to be the answer. I had to use the Legacy System otherwise the app wouldn't archive, and it worked fine in Xcode 11.3, but wouldn't build at all in 11.4.Switching to the "New" build system seems to get it at least building for now, but I've not tried archiving yet, so don't know whether that's been fixed.
This still seems to be an issue. Did you find a solution Mitch?