The agent does not connect
Check profiles/DayzHUB/DHUBconsole/logs/agent.log: "refused" means a wrong Server ID or key, "Not configured" means the default Settings.json. Make sure the mod is loaded with -servermod and the server can reach dayzhub.cloud.
RCON does not connect
Check the RCON port and password in BEServer_x64.cfg, that RCON is enabled, and that your host's firewall lets the port through. Some hosts use a different RCON port from the game port - ask them if unsure.
The live map or FPS are empty
Both need the agent. If the agent is connected, check liveMapEnabled in Settings.json.
A webhook sends nothing
Use Test in Automation. If Discord says the webhook is unknown, it was deleted - make a new one and paste it.
A restart did not happen
Scheduled restarts need RCON or the agent connected at that time. Check the time zone in Settings › Server details.
A player cannot join
Look at Moderation: the whitelist, reserved slots, the name filter and Steam checks tell the player why they were refused. Bans show in Moderation › Bans.