The requested resource does not support the http "PUT" method

I am using AttributeRouting using my web API (MVC 4).

Why does this work?

    [AcceptVerbs("PUT")]
    [PUT("api/v1/tokens/current")]
    public MemoryToken UpdateToken([FromBody] DeviceTokenViewModel viewModel)
    {...}

But this is not?

    [PUT("api/v1/tokens/current")]
    public MemoryToken UpdateToken([FromBody] DeviceTokenViewModel viewModel)
    {...}

Error message: The requested resource does not support the http "PUT" method. Why should I explicitly accept the verb PUT?

I'm just confused because something like this with POST works just fine (I should not indicate accepted verbs):

 [POST("api/v1/tokens")]
 public MemoryToken CreateToken()
 {...}

From other posts which, it seems to me, are related to the setting in my web.config. Currently, the web server section is as follows:

<system.webServer>
<validation validateIntegratedModeConfiguration="false" />
<modules runAllManagedModulesForAllRequests="true" />
<handlers>
  <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
  <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
  <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
  <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
  <add name="AttributeRouting" path="routes.axd" verb="*" type="AttributeRouting.Web.Logging.LogRoutesHandler, AttributeRouting.Web" />
</handlers>

I tried a couple of things like removing WebDav and stuff. But so far nothing has worked (unless you explicitly allow the verb PUT in the annotation).

Oh, I'm using the Visual Studios embedded development server.

Thanks guys!