After enabling Digital Experiences in your Salesforce org and enabling "Enable Case Feed Actions and Feed Items" in Support Settings, the "Community" quick action (used to post case comments to an Experience Cloud site) may still not appear when editing feed-based Case page layouts.
This typically occurs when the org does not have a partner portal or self-service portal enabled, and the "Enable Question-to-Case in Salesforce" setting in Support Settings has not been turned on.
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