The Valorant chat service unavailable error has been annoying players recently and depending on why it's happening, there might be an easy fix.

Valorant Chat Service Unavailable Error: How To Fix

So the number one reason players have reported this issue is due to chat bans in other Riot games like League of Legends. Bans from other Riot games carry over to Valorant, so if you were a little too liberal with your insults and "criticism" in chat in League, you're banned from chat in Valorant too. If this is the case there isn't really anything you can do to fix the issue, but I guess it serves you right for being toxic.

@RiotSupport why cant i see my friends list :( says service unavailable on valorant

— jordy? (@jordyxbee) April 22, 2020

If you've looked deep into your heart and found that you are not a toxic League player, or just haven't been banned for it, the old tried and true turn it off and on again should fix it. It might be annoying to do if you get the error often but it's not the end of the world. Just reset the game and everything should start working again if you aren't banned. There were also some brief server outages due to recent updates but that was fixed.