E-commerce Oauth authorization

Our E-commerce portal is facing issue in oauth login while browsing our adds in facebook after clicking to our add & going for login to purchase that product is not happening
1) For facebook authorization its its redirecting back to facebook page failing login.
2) For google authorization its stuck in loading please wait loader.

Please help me in implementing Oauth in facebook adds

Note:- for normal desktop website Oauth is happening fine, it will create issue only when mobile facebook adds