It's usually because the owner only shared it with a small group of people.
Due to content privacy settings, the Mayor’s official post is currently inaccessible. The post may have been shared only with a limited audience, had its visibility altered, or been removed entirely. For further updates or official announcements from the Mayor’s office, please refer to the city’s official communication channels.

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https://www.facebook.com/122138675606461658/posts/122143169534461658