DJI Smart controller II will not connect to app

I have a DJI 2S with Smart Controller second generation. I disabled the go fly app so it is not running in the background. I removed Litchi app previously downloaded, and re downloaded it again. I have been able to create missions on my lap top and save them, all good so far. I start litchi app and can load mission, however I can not get the app to connect to the drone. Any ideas what I can try?

Thanks

Did you get the Litchi App from Google Play Store?

yes I purchased it from google play