Periodicals with a single section or feed are created as type 0x102 (News Feed), while periodicals with multiple sections/feeds are created as type 0x103 (News Magazine). It turns out that periodicals of type 0x102 have annotation disabled, while type 0x103 can be annotated. This is a Kindle firmware feature, not a metadata option. Calibre uses type 0x102 for single-section periodicals as it simplifies the Kindle UI.
You could manually tweak the file type using a tool like mobi2mobi, or you could create the recipe with an additional feed to force the type to 0x103. I believe that would solve your problem.
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