For anyone interested, I have just published ueberauth_microsoft to hex and the code for it can be found here.

I have started one now, I’m just getting a strange issue where the get_token! function keeps returning a :closed error. Could be something to do with proxy server I am sat behind though! I managed to get past the error but ended up with a timeout issue where the MS login page seemed to just hang and not return a response.

I’m going to try it out when I get home where I’m not be held to ransom by a proxy server.

The :closed error is probably due to a TLS incompatibility between Erlang (18.3.2 and later) and Microsoft servers with modern (SHA256) certificates. The issue has come up in various places over the last year or so, and I just happened to blog about it earlier today: https://blog.voltone.net/post/9 (last section).

TL;DR: you will have to force the connection to use TLS v1.2. The way to do this depends a bit on the TLS/HTTPS client you’re using and the way it wraps Erlang’s :ssl options, but if you’re using the OAuth2 library, this post should help.