NIDiscoveryToken sometimes returns Nil value

I'm using NWConnection to send my discoveryTokens. When an outgoing connection is found, I have the following code:

Code Block 
let session = NISession()
     
guard let token = session.discoveryToken else {
    print("discoveryToken is nil")
    return
}
guard let data = try? NSKeyedArchiver.archivedData(withRootObject: token, requiringSecureCoding: true) else {
    return
}
//  send data ...

Why is it that the discoveryToken sometimes returns nil? Is there a remedy for this?

This has happened on multiple occasions and because of this nothing is sent. There doesn't seem to be a workaround nor any documentation on why this occurs