white screen on https://www.linkedin.com/oauth/v2/authorization, when users try to connect our app with linkedin

Question

For integrating user's linkedin account to our platform, we redirect the user to the linkedin page, to their Auth page, https://www.linkedin.com/oauth/v2/authorization. But only blank white screen is visible.
Earlier it was working fine, but suddenly it stopped working, without any changes in the scope or any other parameters of the url.