Realm Error Domain=Io.Realm.Unknown Code=89 "Operation Canceled"

Realm Error Domain=io.realm.unknown Code=89 Operation canceled

The main issue is that you're mixing the existing Realm Sync documentation with the BETA MongoDB Realm Documentation - apparently a common issue.

The setup is different between the two and you cannot use the MongoDB Realm console to access your Realm Sync database - it can only be used with the BETA MongoDB Realm.

Here's the MongoDB Realm Sync docs noting that your objects need to have a partition key that matches the one set up on the console. Additionally, the connection sequence is different and looks more like this, including the partition and omitting fullSync (and others)

let user = app.currentUser()
let partitionValue = "myPartition"
Realm.asyncOpen(configuration: user.configuration(partitionValue: partitionValue),

The code in your question is for the 'classic' and current Realm Sync. You can access your Realm Sync with the Realm Studio app if you want to stick with the non-beta Realm.

Also note that working with objects is slightly different as well because you need to include the partition value for each object. For example, with MongoDB Realm, adding a task object would be this code

try! realm.write {
  realm.add(Task(partition: partitionValue, name: "My task"))
}

Whereas, with classic Realm its just

try! realm.write {
  realm.add(Task(name: "My task"))
}

can't open Realm using mongodb sync

As a complete guess, your config string is not correct

var configuration = user.configuration(partitionValue: "user=\(user.id)")

As that the partition value resolves to

partitionValue: user=Optional("5f1b586f757611faec257d88")

Try this

guard let user = your_app.currentUser() else {
    print("no user")
    return
}

guard let userId = user.id else {
    print("no user")
    return
}

var configuration = user.configuration(partitionValue: "user=\(userId)")

More to the point though, the partition value you're attempting to use is this string

user=5f1b586f757611faec257d88

and I think what you really want is use the user id

5f1b586f757611faec257d88

That's where I would start. If you're trying to leverage Realm rules, then something like _partitionKey: "team_id=1234" would work but that goes beyond the scope of the original question (and adds another layer of complexity - get it working first, then explore the rules).

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