TUBI UK not showing in app store.

Hi,

 I've used the search function to find the recently released TUBI UK.

The search returns something called TubioTV, but not TUBI.

I've also tried the channel search on this site.

The TUBI site says that it is available on ROKU, but I just cannot find it.

My ROKU is up to date.

Put my mind at rest and let me know if there is an issue between ROKU and the TUBI channel.