How do you cast your peloton bike to the TV?

Just got a peloton bike and I want to cast the bike screen to my TV so I don’t have to try and get the TV peloton app and the bike screen to line up and play at the same time. I got a new TV to do the casting and of course I didn’t get the right TV. I got a tcl class 4 series 4 4K uhd hdr smart android TV. I thought Bc it said smart TV with built in chrome cast that it would work but can’t figure it out. So I got the Amazon fire stick  4k and it worked a few times but it was delayed on the tv by 2 secs. And now all of a sudden it won’t cast the screen to the fire stick. The fire stick will show up on the peloton and connect for 5 seconds and then disconnect and then the peloton freezes.  What am I doing wrong and what do I need to do to cast the peloton screen??? Please help