(#200) Requires permission: pages_messaging or User associated with the Page access token does not have an appropriate role on the Page

I have all permission replated "me/conversations" this endpoint in graph api but I still get below error "(#200) Requires permission: pages_messaging or User associated with the Page access token does not have an appropriate role on the Page" My final usecase is I have to connect page with google dilogflow and I have same error in there also

I have try with adding additional replated permissions