Question IL2CPP build error - Failed to resolve assembly: 'MultiplayerImport'

I'm running Unity 2022.2.2f1 URP, trying to do a Windows IL2CPP build. I get this error regardless of .NET Framework or .NET Standard when using IL2CPP. I don't know what "MultiplayerImport" is.. any ideas how to debug this further?

Code (CSharp):

1. Build completed with a result of 'Failed' in 55 seconds (55131 ms)
2. Building Library\Bee\artifacts\WinPlayerBuildProgram\ManagedStripped failed with output:
3. C:\Program Files\Unity\Hub\Editor\2022.2.2f1\Editor\Data\il2cpp\build\deploy\UnityLinker.exe @Library\Bee\artifacts\rsp\2410473323318317743.rsp
4. Fatal error in Unity CIL Linker
5. Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'MultiplayerImport, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'
6.    at Unity.IL2CPP.Common.MissingMethodStubber.GetTypeModule(TypeReference type, IEnumerable`1 assemblies)
7.    at Unity.Linker.Steps.AddUnresolvedStubsStep.MarkAssemblyOfType(UnityLinkContext context, TypeReference type)
8.    at Unity.Linker.Steps.Marking.UnresolvedStubMarking.HandleUnresolvedType(TypeReference reference)
9.    at Unity.Linker.Steps.UnityMarkStep.HandleUnresolvedType(TypeReference reference)
10.    at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference, DependencyInfo reason, IMemberDefinition sourceLocationMember)
11.    at Mono.Linker.Steps.MarkStep.MarkField(FieldDefinition field, DependencyInfo& reason)
12.    at Mono.Linker.Steps.MarkStep.MarkFields(TypeDefinition type, Boolean includeStatic, DependencyInfo& reason, Boolean markBackingFieldsOnlyIfPropertyMarked)
13.    at Mono.Linker.Steps.MarkStep.ApplyPreserveInfo(TypeDefinition type)
14.    at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference, DependencyInfo reason, IMemberDefinition sourceLocationMember)
15.    at Mono.Linker.Steps.MarkStep.MarkField(FieldDefinition field, DependencyInfo& reason)
16.    at Mono.Linker.Steps.MarkStep.MarkEntireTypeInternal(TypeDefinition type, Boolean includeBaseTypes, DependencyInfo& reason, IMemberDefinition sourceLocationMember, HashSet`1 typesAlreadyVisited)
17.    at Mono.Linker.Steps.MarkStep.MarkEntireTypeInternal(TypeDefinition type, Boolean includeBaseTypes, DependencyInfo& reason, IMemberDefinition sourceLocationMember, HashSet`1 typesAlreadyVisited)
18.    at Mono.Linker.Steps.MarkStep.MarkEntireAssembly(AssemblyDefinition assembly)
19.    at Mono.Linker.Steps.MarkStep.InitializeAssembly(AssemblyDefinition assembly)
20.    at Unity.Linker.Steps.UnityMarkStep.InitializeAssembly(AssemblyDefinition assembly)
21.    at Mono.Linker.Steps.MarkStep.Initialize()
22.    at Unity.Linker.Steps.UnityMarkStep.Process(LinkContext context)
23.    at Unity.Linker.UnityPipeline.ProcessStep(LinkContext context, IStep step)
24.    at Mono.Linker.Pipeline.Process(LinkContext context)
25.    at Unity.Linker.UnityDriver.UnityRun(UnityLinkContext context, UnityPipeline p, LinkRequest linkerOptions, TinyProfiler2 tinyProfiler, ILogger customLogger)
26.    at Unity.Linker.UnityDriver.RunDriverWithoutErrorHandling(TinyProfiler2 tinyProfiler, ILogger customLogger)
27.    at Unity.Linker.UnityDriver.RunDriverWithoutErrorHandling()
28.    at Unity.Linker.UnityDriver.RunDriver()
29. UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

 

I'm having the exact same issue on 2022.1.23 so I can add that I've extensively searched all my .asmdef files for any reference to anything called "multiplayerImport" to no avail.
I'm also having this issue only on Android, IL2CPP builds for other platforms work normally

 

Hmm that's weird. For me it doesn't build for Windows either. What .NET framework packages do you have installed on your PC? I wonder if we're using an old package or incorrect SDK

 

@Duskp Oh, and do you have some form of Photon asset in your project?

 

I've submitted bug report IN-30142 - Unfortunately its a fairly large project that you need to DL, but just build the player and you'll get the error. At least I do on my machine.

 

Any news? Hoping to get a build up of our game before long.