There is no UI for Xamarin workaround for this. The maximum SDK version Telerik UI for Xamarin (Forms) currently supports is 23.3.0 (we are working on updating this this to Android 7 and is planned for an upcoming release). Please see this documentation for more information
One route you can take is to downgrade your version of Firebase to a version that supports 23.3.0, then you can compile both together.
Alternatively, you can use UI for Xamarin.Android in a Xamarin.Android app instead of a Xamarin.Forms app. We do support Android 7, just not with the Xamarin Forms wrappers yet.
Lance | Tech Support Engineer, Sr.
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