Can't set permissions with API Key like I used to?

import { Client, Account, Databases, Users, Permission, Role, Query, ID } from 'node-appwrite';

export default async ({ req, res, log, error }) => {

  if (req.path === "/") 
  {
    const userId = req.headers['x-appwrite-user-id'];
    
    const client = new Client()
       .setEndpoint(process.env.APPWRITE_FUNCTION_API_ENDPOINT)
       .setProject(process.env.APPWRITE_FUNCTION_PROJECT_ID)
       .setKey(process.env.APPWRITE_API_KEY);
    
    const db = new Databases(client);
    const event = req.headers['x-appwrite-event'];
    
    if(event === "users." + userId + ".create")
    {
        let createUserDoc = await db.createDocument('db', 'users', userId, { name: "null", picture: "null"}, [ Permission.delete(Role.user(userId)) ]);
      
    }
  }
  return res.json({ status: "complete" });
};```

Now, a few months ago, I was able to set the "delete" permission for that document so that only that specific user could delete it. But now I get this error on the server when I create a user:

Error: Permissions must be one of: (any, guests)

If I change it to Role.any(), there are no errors, but that's not the functionality I want. Am I missing something? I have enabled all scopes for my API key to make sure that's not an issue. How can I make it so that only the user who created that document is the only one who can delete it?