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I believe you might be referring to the old WPSSO JSON add-on, which was deprecated over a year ago. The following add-ons have all been deprecated over the past years and are no longer available:
- WPSSO Inherit Parent Metadata
- WPSSO Schema JSON-LD Markup
- WPSSO Organization Markup
- WPSSO Place and Local SEO Markup
Their features have all either been integrated into WPSSO Core, or been replaced by a different add-on (for example the WPSSO ORG and PLM add-ons were replaced by a better add-on to manage both organizations and places as custom post types).
You can continue to use the WPSSO JSON add-on if you wish, but since we no longer develop or test that add-on for compatibility, we do suggest deactivating it.
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