When you make a request, you get an error:
{"error":{"message":"Error validating access token: Session has expired on Wednesday, 20-Jan-21 08:00:00 PST. The current time is Thursday, 21-Jan-21 05:12:26 PST.","type":"OAuthException","code":190,"error_subcode":463,"fbtrace_id":"AWnxV0HHBAo0ZOANy4K1zEH"}}
Most likely, you created a token and did not extend it to 60 days - in this case, it seems to be valid for only 1 hour.
This can be done in Facebook Developer Tools, here is the first article from the Internet on this topic
https://ideaincode.com/%D0%BA%D0%B0%D0%BA-%D0%BF%D0%BE%D0%BB% D1%83%D1%87%D0%B8%D1%82%D1%8C-facebook-page-access-token-%D0%B8-%D0%BF%D1%80%D0%BE%D0%B4% D0%BB%D0%B8%D1%82%D1%8C-%D0%B5%D0%B3%D0%BE/