Watchkit Extension Cannot Read from iCloud - swift

Question

I am looking for the watchkit extension to read a file from iCloud document storage. I wrote the file from the iOS app which is also able to read it. I am leveraging a shared class so the code is the same. The problem is that on the watch, the URL for the cloud container returns nil.
static func readFromFile(fileName:String) -> String?
{
let fileManager = FileManager.default
var cloudURL = fileManager.url(forUbiquityContainerIdentifier: nil)
cloudURL = cloudURL?.appendingPathComponent("Documents/\(fileName)")
do
{
return try String(contentsOf: cloudURL!)
} catch {
print (error)
return nil
}
In the case above, cloudURL is nil on the watch but not the phone. For the forUbiquityContainerIdentifier I checked that the same identifier is used for both watch and phone. I have also tried to directly enter the name rather than using nil and letting it grab it from the entitlements. The format of the container:
iCloud.com.company.app
It's my understanding that Watch OS 3 is supposed to be able to use iCloud.
Update:
I printed out let token = fileManager.ubiquityIdentityToken and I get the following:
WatchKit Extension[390:687462] [default] [ERROR] error while getting
ubiquityIdentityToken: Error Domain=NSCocoaErrorDomain Code=4099 "The
connection to service named com.apple.bird.token was invalidated."
UserInfo={NSDebugDescription=The connection to service named
com.apple.bird.token was invalidated.}

Answer 1

I have officially heard back from Apple that this is not a supported feature of Watch OS. This runs contrary to their own documentation which I let them know about. Hopefully others see this response and it can save a ton of time that I wound up wasting.

Answer 2

It was 2021. Apple documentation still says that iCloud Drive methods can be used by watchOS 2.0+, but url forUbiquityContainerIdentifier returns nil :(