Insert not permitted with template rule

MongoDB Atlas App Services & Realm
,
1

Hi all,
I am stuck with the template rule where users can read and write their own data. I have used the Realm UI to deploy this rule

{
  "user_id": "%%user.id"
}

But I am getting back the error

insert not permitted (status 403)

Is this correct? Where else should I look to fix because I am stumped by this

2

Have you set the flag to indicate that the owner is allowed to insert?

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Does the document you’re trying to insert include a field named user_id?

3

Thanks Andrew for your reply. What I was trying to achieve was something like the below;
It appears the rules do not work with multiple conditions. Is the syntax below correct. Say:

{ 
    "agency": "%%user.custom_data.agency",
    "%%user.custom_data.isAdmin": true 
}