Android

No matter the client - the setup should be the same. As long as you follow these steps then it should work. 

1. Download client of choice
2. Add domain to client - it will need to have https:// at the beginning to make sure to either add it or that the app pre-fills it. For example, streamyfin does but findroid does not. (ex. https://finleys-media.com vs finleys-media.com)
3. log in using the user id and password

For specialty clients such as jellify for music - you may need to select the music library.