GCD Timer not calling Event Handler

Setup a GCD timer, the print statement "ABTimer Fired" is being called, but not "ABTimer Fired Block" and I cannot figure out why! Any ideas?
Here is my basic code, comment for clairity:

class ABTimer {
    
    private var timer: DispatchSourceTimer!
    
    /// Creates a timer
    @discardableResult
    init(fire: Date, interval: TimeInterval, repeats: Bool, block: @escaping (ABTimer) -> Void) {
        // Cancels existing timers
        timer?.cancel()
        // Queue a new timer
        let queue = DispatchQueue(label: "com.applebot.timer", attributes: .concurrent)
        // Make the timer
        timer = DispatchSource.makeTimerSource(queue: queue)
//        let i = fire.timeIntervalSince(Date()) // Code for determing fire date
        if repeats {
            // If repeating, schedule a repeating timer
            timer?.schedule(deadline: .now(), repeating: interval, leeway: .milliseconds(100))
        } else {
            // if not repeating, schedule a non-repeating timer
            timer!.schedule(deadline: .now())
        }
        // Set event handler
        timer?.setEventHandler(qos: .background) { [weak self] in
            print("\(Date()) >>>> NOTICE: ABTIMER FIRED BLOCK")
            guard let ss = self else { return }
            block(ss)
        }
        print("\(Date()) >>>> NOTICE: ABTIMER FIRED")
        // Start Timer
        timer?.resume()
    }
}