Using the google chromecast remote

Hi, happy new years everyone.

I am using fbplus and watch it on a chromecast with google tv. With that I have a remote for google tv, but it seems like I can't pause a fitnessblender video using the remote. I also can't pause with my phone anymore when it's casting. I think I tried the various adds free player options in my account.

Anyone having the same problem or knows how to pause a video?