"Logging into Chat Service" (Or Similar) *SOLUTION*
Hello, recently a lot of people have been struggling trying to play with friends because of the "Logging into chat service" at the bottom of the screen. I have found a very simple solution which causes you no harm. Simply follow these steps
Close LoL first
Step 1: Open Start Menu Step 2: Open Control Panel Step 3: Search "Date and time" Step 4: Select "Set The Date and Time" Step 5: Change to 1 day ahead or more if you'd like Step 6: Restart LoL. Step 7: Have fun and League on!
UPDATE I've only tested this on Windows and not Mac OS. From what I know it has worked for me and my friend on Windows.