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On the phone app, select "Schedule service" and request an update that way. 2019.12.1.2 isn't that old, though. It was the most common version immediately prior to 2019.16.2.
That doesn't always work. I had an appointment scheduled (for actual service). They generated an update request to be sure it wasn't a software issue before they contacted me with troubleshooting. Even though there was a big push at the time into a new update, my car updated with what it already had. It may just not be your time. There isn't a ton of transparency in how the cars get updated, the key word is patience.
If you are still running a long ago updated OS then contact service. You can see what everyone else is currently running at:
Just coming back to repeat that if you have an SR+ or MR Model 3 and have 19.15.11, I'd LOVE to see your % and kW data from a Supercharging session. You might get up to 150kW when starting below ~18% SoC.