I'm working through this, but TSDProxy requires the labels to be on the serving container, which is not the AIO container. This is likely working for you because TSDProxy looks at port 11000 and then Nextcloud AIO is switching the port to (eventually) the Apache container to actually run. This appears to be problematic if you don't do it right when the AIO container starts, because TSDProxy won't set up correctly after the port is switched. And, at least in Unraid, it's impossible to add labels to the Apache container since it's created automatically by the AIO container.