.net - IXXXOAuth2AuthenticationProvider Authenticated called but User is always null -

good day.

im having trouble oauth. have code users works , others doesn't. me depends on browser, chrome+firefox works, while ie edge doesn't - no errors, no exceptions.

this piece of code:

appbuilder.usefacebookauthentication(new facebookauthenticationoptions         {             appid = cfgreader.facebookappid,             appsecret = cfgreader.facebookappsecret,             scope =                 {                     "email"                 },             signinasauthenticationtype = constantstrings.authorizationcookiename,             backchannelhttphandler = new facebookbackchannelhandler(),             userinformationendpoint = "https://graph.facebook.com/v2.4/me?fields=id,name,email",             provider = new facebookauthenticationprovider             {                 onauthenticated = (context) =>                 {                     context.identity.addclaim(new system.security.claims.claim("facebookaccesstoken", context.accesstoken));                     foreach (var claim in context.user)                     {                         var claimtype = string.format("urn:facebook:{0}", claim.key);                         string claimvalue = claim.value.tostring();                         if (!context.identity.hasclaim(claimtype, claimvalue))                         {                             context.identity.addclaim(new system.security.claims.claim(claimtype, claimvalue, "xmlschemastring", "facebook"));                         }                     }                      return task.fromresult(0);                 }             }         }); 

should make application able login user , read 1 name , email. , works on machine , ff/chrome. when run on edge fails. failing part not here, in part:

 var manager = this.httpcontext.getowincontext().authentication;  authenticateresult result = await manager.authenticateasync(constantstrings.authorizationcookiename).withcurrentculture<authenticateresult>(); 

problem user in manager null. if put breakpoint in authenticated event i'm able read data authenticated user. somewhere i'm being nulled have no idea why , where. same goes google authentication, practically identical code authenticated, similar use case: on authenticated full user data next user null.

any advice appreciated.