For some reason my https://graph.facebook.com/210155825774263 returns an error :
{
\"error\": {
\"message\": \"Unsupported get request.\",
\"t
1.admin panel click onEdit page(at the top right of the window) select edit setting
check Age restrictions : select 'Anyone (13+)'
save change( as you can see in image)
This error occur due to several problem in permissions of your page
1. go to edit page ->manage permission
check Age restrictions : 13+
2. go to basic information -> Start Type:: set to launched
The page you are having trouble with is not accessible without user access token or has some or the other restrictions which are resolved only when a user logs in.
I had this problem because i forgot to disable the sandbox mode. To disable it goto Settings->Basics->Sandbox Mode
I had also encountered this problem, and it was because the Facebook page I was managing had "County Restrictions" set in the Manage Permissions menu. Once I removed this restriction, the graph error went away.
For me adding &limit=8 in the url solve the problem, I think there were just too much information to send, and this limitation seems to be only in dev mode. Of course for me it is 8 but for you it can be limit=1
https://graph.facebook.com/v6.0/{{pageId}}/feed?access_token={{your token}}pretty=1&fields=reactions.type\u002528LIKE\u002529.limit\u0025280\u002529.summary\u0025281\u002529.as\u002528like\u002529\u00252Creactions.type\u002528LOVE\u002529.limit\u0025280\u002529.summary\u0025281\u002529.as\u002528love\u002529\u00252Creactions.type\u002528WOW\u002529.limit\u0025280\u002529.summary\u0025281\u002529.as\u002528wow\u002529\u00252Creactions.type\u002528HAHA\u002529.limit\u0025280\u002529.summary\u0025281\u002529.as\u002528haha\u002529\u00252Creactions.type\u002528SAD\u002529.limit\u0025280\u002529.summary\u0025281\u002529.as\u002528sad\u002529\u00252Creactions.type\u002528ANGRY\u002529.limit\u0025280\u002529.summary\u0025281\u002529.as\u002528angry\u002529\u00252Cfrom\u00252Ccomments.limit\u00252810\u002529.summary\u002528true\u002529\u00252Cmessage\u00252Cstatus_type\u00252Cobject_attachment\u00252Cmessage_tags\u00252Cpermalink_url\u00252C+attachments\u00257Btitle\u00252Cdescription\u00252Cmedia_type\u00252Cunshimmed_url\u00252Ctarget\u00257Bid\u00257D\u00257D&limit=8