There aren't any bracket tourneys showing up on the new platform, mobile or desktop. I sent in an inquiry as to why and this is the response I received:
Hi, thanks for your report. I have passed this info along to our Q/A team to investigate and work on a resolution for this. We appreciate you taking the time to message us with this issue and we hope to have it resolved for you soon. Thank you for your patience, Sincerely WGT Member Services.
That being said, even before Flash was retired, I noticed that bracket tourneys were very limited on the mobile app. I could only play ones I entered through the website as they would then show up under "my tournaments". Hopefully now that the app is the only way to play, they will actually work on a fix as there are quite a few players who pay to play in the bracket tourneys.