I am making a practice WAV file of a new song for our band to practice to, so I would like to include the metronome.
 
I already have the metronome routed to the Master bus and the metronome is set to sound on playback.
I tried exporting the Entire mix and also, Busses/Master bus. Neither result in a WAV including the sound of the metronome.
 
How does one get the metronome sound on the exported file?

Not possible directly.

You should be able to do this by having the metronome sub route to master or if not using a sub, routed directly to the master... I believe in Preferences...?

Remember that it will not be on a separate track. You can make it one side of the stereo out and make the music mono on the other side. This woukd alliw use of balance or splitting to adjust relative volume...

I believe you must also enable metronome during playback?

The way I usually deal with that type of situation is to create a separate click track using a simple stick/block hit loop.

rcklln
The way I usually deal with that type of situation is to create a separate click track using a simple stick/block hit loop.

A perfect task for TTS

This has come up many times - I don't believe there's a way to route the internal audio metronome to your output WAV or MP3 rendering.  I think the only way you can accomplish this is by adding MIDI track, routing your metronome to that MIDI track and route the output of the MIDI track to a soft synth (or to an external hardware synth) to produce the click sound audio, which you can then record / route as any other audio signal into your mix.

I had raised that question a while ago (see thread) - one way to achieve this is here

It would seem to me that the upcoming "Virtual Patch Points" feature would be a way to loop the audio from the metronome back to a track and capture it that way...which would be great...until you decide to change the tempo.  Then you'd have to recapture it.
 
Maybe the stunt where you create a chopped up groove clip and drag it out is the best solution (as referenced in the link above).