The following article will cover the steps needed to enable crossplay on your 7 Days To Die Server Hosted By Host Havoc.
1. Go to your gamepanel, make sure your server is not running, and left click 
2. Select the configuration file that applies to your server. By default it would be "serverconfigfull.xml". Press 
3. A new tab will open. You will want to scroll down to where it says "Other Technical Settings". Tick "Server Allow Crossplay" and "EAC Enabled". 
4. Crossplay also has strict requirements. Ensure that your server's configurations are within the limits:
XPMultiplier 25 – 300
DayNightLength >= 10
BloodMoonEnemyCount 4 – 64
AirDropFrequency >= 24
BlockDamagePlayer 25 – 300
BlockDamageAI >= 25
BlockDamageAIBM >= 25
LootAbundance <= 200
LootRespawnDays >= 5
5. Once this is done, press "Save & Exit". 
6. Start your service, and connect to it.
