@Nathan Sokaski
You would need something like the following in your proj file.
<RuntimeIdentifiers Condition="'$(Configuration)'=='Release'">android-arm64;android-arm</RuntimeIdentifiers>
See https://learn.microsoft.com/en-us/dotnet/core/rid-catalog for a complete list of RuntimeIdentifiers for Android.
The example above covers all modern Android devices. I think the minimum API now is 25 for net9.0-android35. I'm not sure because I don't go that low.