WDA Driver Not Active -> waitForQuescience – Sauce Labs

If you see an error containing:
Cannot call proxyCommand without WDA driver active

add these desiredCapabilities

caps.setCapability("waitForQuietness", false);
caps.setCapability("waitForQuiescence", false);
caps.setCapability("wdaEventloopIdleDelay", 7);
caps.setCapability("eventLoopIdleDelaySec", 4);
caps.setCapability("startIWDP", true);

YMMV as this is an issue on the iOS side and the Apple team would have to address this. The application under test does not maintain idle mode long enough for the test manager daemon to interact with its accessibility layer.