Please fix this 

What specifically are you doing, what is your config, what is not working?

{
"Limits": [
{
"Type Name": "Any",
"Max Authorized": 1,
"Shortnames": [
"global"
],
"Disable For Decaying Structures": true,
"Notify Player": true,
"Notify Owner": true,
"Enforce": true,
"Deauthorize": true,
"Deauthorize All": true,
"Discord": {
"Webhook": "",
"Inline": true,
"Title": "Group Limit: Exceeded or deauthorized",
"Color": 0,
"Player Title": "Player",
"Player": "{name}/{id}",
"Authed Title": "Authorized Players",
"Authed": "{list}",
"Authed Entry": "{name}/{id}",
"Authed Separator": "\n",
"Entity Title": "Entity",
"Entity": "{shortname}/{id} ({type})",
"Position Title": "Position",
"Position": "teleportpos {position}"
},
"Log To File": true
}
],
"Log Format": "[{time}] {id} ({name}) authorized on {shortname}/{entid} ({type}) at ({position})"
}

Merged post

I test it with my friend, but it is not working at all 

Merged post

place cupboard and get author   and my friend can get author too. 

how to fix this problem?

Make sure it is not decaying and that you do not have the ignore permission.