Wcsession Has Not Been Activated

WCSession has not been activated

I figured out the problem I had, and I think yours is similar. I was trying to send a message immediately after calling activate(), which worked in the past, but since the introduction of the session(activationDidCompleteWith:) function I needed to send my messages from there.

So I think your solution is one of these:

1. Make your InterfaceController be the WCSessionDelegate, move all
   WCSession activation calls there, and send the message from
   session(activationDidCompleteWith:)
2. Send the message from
   session(activationDidCompleteWith:) in the ExtensionDelegate (in my
   app I handle all communication in the ExtensionDelegate)
3. Post a notification from session(activationDidCompleteWith:) in the
   ExtensionDelegate and add an observer to handle it in
   InterfaceController

Aside from this, I think you may also have a problem because the declaration of session(didReceiveMessage:) is wrong in your AppDelegate (or at least I had a problem when I tried your code.)

The new declaration is:

func session(_ session: WCSession, didReceiveMessage message: [String : Any], replyHandler: @escaping ([String : Any]) -> Void)

watchOS, WCSession activationDidCompleteWith activated , yet is not reachable

For those in a similar boat, I never ended up finding the cause of this problem. However, as a bit of a workaround, I looped up my start session function, to attempt a new connection every couple of seconds when a connection has failed, and it needs to send/receive data. The second connection attempt was basically successful every time.

Unable to activate WCSession

Implement the new WCSessionDelegate callback so you can receive any errors / tell when the session activates.

          optional func session(_ session: WCSession,
activationDidCompleteWithState activationState: WCSessionActivationState,
                         error error: NSError?)

or

- (void)session:(WCSession *)session
activationDidCompleteWithState:(WCSessionActivationState)activationState
          error:(NSError *)error

How to fix [WC] denying activation due to missing delegate Swift

These two lines make no sense

session?.delegate = self  // session is still nil here, delegate won't be set
session = WCSession.default

change the order to

session = WCSession.default
session?.delegate = self 

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