Anyone else not able to sign into the game streaming iOS app for xcloud?

You will be able to use this feature when xCloud launching. You will be able to streaming to other devices.

Also, there is an app for Android and iOS called Onecast, maybe you should try.

Well for iOS you MUST have iOS account

And xgu linked to the account if you don't you can't stream as xgu is needdd

Xbox gamepass ultimate

Xbox Game Pass (xCloud) on iOS What app do I need?

You'll need to download the Xbox Game Pass app from the App Store in order to use it. Downloading the app is free, however, you'll need to pay a subscription in order to actually access any of the games.

When you say streaming can you clarify a bit so we can better help troubleshoot?

Are you talking about streaming to Mixer or Twitch?

Local streaming to the Windows 10 Console Companion App?

Streaming from the beta xCloud service on Android or iOS?

Streaming the beta remote Console Streaming on Android or iOS?

Or a different method?

Which ever it is will wildly change our ability to help, and where the best place to post might be. Let us know!

Yes it's called remote play

But still requires a console unlike xcloud

And a good connection

Playsstation and xbox both have it

But very limited

Xcloud has larger support

https://www.digitaltrends.com/gaming/xbox-game-streaming-how-to/

Its a bit dated but the steps are the same and ios is supported for xcloud

No, the Streaming app for xCloud allows for online play of those xCloud games or will allow you to stream your Xbox games to your phone.