Google searches:

• how to deal with disappeared facebook page
• facebook page disappeared 2020

Articles

• Missing Facebook Pages: What to Do When Facebook Takes Your Page Away
  • December 4, 2015 - Social Media Marketing Podcast, produced by Social Media Examiner
    • Accounts had been secured:
      • We secured email with 2-step authentication to our corporate Gmail accounts and we turned on Facebook Login Approvals. Plus, we recently completed a security audit of everyone on our team, and have a master document of who has administrative access to what.
      • The Facebook Support Inbox - https://www.facebook.com/support/
        • Has spam notifications, and important message about your account
      • Community Ask A Question - https://www.facebook.com/help/community/ask/
        • Does not have “Pages” as a topic
      • Help topics:
        • Why would Facebook Page get taken down or have limits placed on it: https://www.facebook.com/help/348805468517220
        • Facebook business center for creating and managing accounts - https://www.facebook.com/business/help/148723649153231

Other articles not yet read:

• https://turbofuture.com/internet/Why-Was-My-Facebook-Page-Deleted
  • Report an issue with facebook pages - https://www.facebook.com/help/contact/164405897002583?show_form=pages_bug
    • Got this answer:
      • Form submitted successfully
      • Thanks for contacting Facebook. You should receive an email response shortly.

Read articles:

• How does a facebook page just disappear without a trace
  • It could have been deleted. Make sure you know who all the admins are for your pages, and you have secure passwords. Pages can only be deleted from the page creator accounts, so look there for any suspicious activity.
  • Unpublished page. An administrator could change the page to unpublished.
  • Breach of Conduct with FAcebook - you should be notified if this happens
  • Technical issues - Contact facebook if you have no explanation why your page vanished.

Some possibly related pages:

• Facebook: How do I Delete a Page?
• Facebook: What is the Difference Between Published and Unpublished?
• Facebook: Facebook Pages Terms