Don't get the simplest FireStore security rule to work as if it would not find my file - though looks like examples - google-cloud-firestore

Question

I don't get this running, no matter what I do. I have already removed all rules, nevertheless I get simulated read denied. I habe tried companies/4U4kZKXkr3rHA6B04S5K and /companies/4U4kZKXkr3rHA6B04S5K as location, copy pasted the document id and the collection multiple times, nothing... To me, it looks just like all the running examples, I found
What am I doing wrong?!
UPDATE: I used these rules before, which did not work:
match /databases/{database}/documents {
// the request object contains info about the authentication status of the requesting user
// if the .auth property is not set, the user is not signed in
function isSignedIn() {
return request.auth != null;
}
// return the current users entry in the employees collection
function getEmployeeData() {
return get(/databases/$(database)/documents/employees/$(request.auth.uid)).data
}
// check if the current user has access to specific company
function accessCompany(companyId) {
return isSignedIn() && getEmployeeData()['companyId'] == companyId;
}
// check if the current user has a specific role
function hasRole(role) {
return isSignedIn() && getEmployeeData()[role] == true;
}
// check if the user has any of the given roles (list)
//function hasAnyRole(roles) {
// return isSignedIn() && getRoles().keys().hasAny(roles);
//}
}
match /users/{user} {
// anyone can see a specific users profile data (name, email etc), in a real scenario you might want to make this more granular
allow get: if true;
// noone can query for users
allow list, create: if false;
// users can modify their own data
allow update, delete: if request.auth.uid == user;
}
match /employees/{user} {
// only allow admins to set roles. Of course a user should be able to retrieve its own designated roles
allow get: if request.auth.uid == user || hasRole('admin');
allow list: if hasRole('admin');
allow update: if hasRole('admin');
allow create, delete: if false;
}
match /companies/{document=**} {
allow get, list, create, update, delete: if true;
}
}

Answer 1

By default, no read and write access is allowed to any document. If you want to allow access to a document, you must have at least one rule that matches the query that would allow that access. If you have commented out all your rules, then I would expect no reads or writes to be allowed.
Minimally, adding a rule like this will allow read access to all documents in the companies collection:
match /companies/{id} {
allow read: if true;
}
I suggest reviewing the documentation on security rules to better learn how they work.