Using a standard browser there is no problem using Mapillary API and navigating to https://www.mapillary.com/connect?client_id=XXX. After submitting my credentials there is a redirect that gives a code in the url.
The problem is that when I try to connect to the API using a software called FME, I get to a page that basically says that my browser is unsupported (https://www.facebook.com/unsupportedbrowser). FME makes a GET request to the same url as the one who works directly in the browser, so everything should work. Connecting with FME to the root endpoint for metadata works fine with OAuth 2. Any suggestions?