When you start the tournament, you will see that the default bet is set to 2, but you have to manually change it to 1 for it to work. It is also written in the information you screenshotted for me.
Dear Chris first of all remove this idea about RTP. In slots only luck plays important role. Secondly I am too searching the tournaments like casin guru where no deposit or fee is required. If you have information then please write.