I customized the name of the server, password, etc. all of that works. However, the clan size is always 4. I've changed the number in every file that is created, in server_data and VRisingServer_Data too just in case.
Ok, so this is what was causing it for me. When I started my own server, I wanted it to be PvE, so I went googling and found a solution that worked, but I didn't fully understand the configuration files or how they refer to each other. My solution to changing it from PvP to PvE was to use a preset, which worked, but messed me up when I wanted to change further settings.
{
"Name": "Bijouvania",
"Description": "1-900-OK-FACE",
"Port": 9876,
"QueryPort": 9877,
"MaxConnectedUsers": 40,
"MaxConnectedAdmins": 4,
"ServerFps": 30,
"SaveName": "Bijouvania1",
"Password": "*********",
"Secure": true,
"ListOnMasterServer": true,
"AutoSaveCount": 50,
"AutoSaveInterval": 600,
"GameSettingsPreset": "StandardPvE",
"AdminOnlyDebugEvents": true,
"DisableDebugEvents": false
That line "GameSettingsPreset": "StandardPvE", made the server use an unknown-to-me preset config file from "VRisingServer_Data/StreamingAssets/GameSettingPresets/" which ignored all the settings in "ServerGameSettings.json", no matter how many times I changed "ClanSize".
The fix, is either change setting in the preset, or create your own, and adding or changing the ClanSize variable, (in my case StadardPvE.json) or remove the preset line and configure my server using the ServerGameSettings.json file.
Hope that helps.