It works!
So happy with it. Wasn’t sure if it would work but it did. Worked on my titanium radio controlled citizen. I only just found out about this app from an online watch forum. I had no option of getting any signal living in Singapore, but now I do! Originally I used the China atomic clock station from the app, but it didn’t work. Then I set my watch time to UK time and used the station in Germany worked like a charm. Put my watch face down against the phones face and on top of the on screen arrows, done!