default framebuffer errors

Magnum::GL::Framebuffer& lvn::CRenderMgr::GetDefaultFramebuffer()
{
	if (_default_frame_buffer) {
		return *_default_frame_buffer;
	}

	// references:
	// https://stackoverflow.com/questions/9746602/getting-default-frame-buffer-id-from-glkview-glkit/9755439#9755439
	// https://docs.microsoft.com/en-us/dotnet/api/android.opengl.gles11ext.glframebufferbindingoes?view=xamarin-android-sdk-9
	// GL_FRAMEBUFFER_BINDING_OES is 36006 according to microsoft, same as GL_FRAMEBUFFER_BINDING: 0x8CA6

	GLint sdl_default_FBO_index;
	/*glGetIntegerv(GL_FRAMEBUFFER_BINDING_OES, &defaultFBO);*/
	glGetIntegerv(GL_FRAMEBUFFER_BINDING, &sdl_default_FBO_index);
	glGetIntegerv(GL_RENDERBUFFER_BINDING, &_sdl_render_buffer_index);
	
	/*Magnum::Debug{} << "sdl default framebuffer index: " << sdl_default_FBO_index;
	Magnum::Debug{} << "sdl render buffer index: " << _sdl_render_buffer_index;*/

	const auto viewport = Magnum::GL::defaultFramebuffer.viewport();

	_default_frame_buffer = std::make_unique< Magnum::GL::Framebuffer>(
		Magnum::GL::Framebuffer::wrap(sdl_default_FBO_index, viewport)
	);

	return *_default_frame_buffer;
}

// I hit the below errors

auto status = default_buffer.checkStatus(Magnum::GL::FramebufferTarget::Read);
if (status != Magnum::GL::Framebuffer::Status::Complete) {
  Magnum::Error{} << "default framebuffer status read error: " << status;
  result = false;
}

status = default_buffer.checkStatus(Magnum::GL::FramebufferTarget::Draw);
if (status != Magnum::GL::Framebuffer::Status::Complete) {
  Magnum::Error{} << "default framebuffer status draw error: " << status;
  result = false;
}

Error outputs:

default framebuffer status read error:  GL::Framebuffer::Status::IncompleteMissingAttachment
default framebuffer status draw error:  GL::Framebuffer::Status::IncompleteMissingAttachment