What Multiplayer and Matchmaking Services do you guys recommend?

I had a quick test of Unity's NetCode Package but it does not provide Matchmaking Services as of this writing.

Game Requirements:
1. Requires exactly 2 players for every match in the same scene and they will be playing in real-time.
2. There should be multiple matches/scene instances that needs to happen as there will be more than 2 players in the Match Queue.
3. Real-time metrics; e.g: progress bar of each player, score of each player.
4. Player Data Storage/DB
5. Android Release


So, I need this list of questions answered:

1. Can I use NetCode together with a 3rd party Matchmaking Service?
2. Am I better off just using a Matchmaking service alone without using NetCode?
3. If question number 2 is true, what Matchmaking Service is the most simple to use?
4. Do I need an Authentication/Login to be able to use Matchmaking?
5. What BaaS will provide the game's requirements? And possibly its future requirements? (service scalability)

I need the BaaS' APIs written in C# as I intend to stick with C#.


Your input will be highly appreciated.