I had the nav/phone issues since May 2023. In June, I took my 2020 Atlas CS SEL Premium to the dealer in Minneapolis and after a couple of days they informed me that I needed a new "Car-Net Module". It is on backorder with no ETA available, this is from VW's Customer Care department. The parts manager told me that most of these modules are sourced in Ukraine, hence don't hold your breath for one.
We returned to Tucson, AZ this fall (we are snowbirds), and needed an oil change. While at our selling dealer getting the oil changed, I let them know about our Nav/phone issues, expecting the same diagnosis. They wanted to keep the car for a day or two to see what their guys could do. 48 hours later, everything is all sorted and everything works! They rebooted/reprogrammed the offending module and discovered a marginally adequate battery that they thought compromised the module from booting up properly. Whatever, these guys here in Tucson went the extra mile and truly diagnosed the real problem and causes and fixed it. Hopefully, it continues to function. We shall see.
PS - the battery was out of warranty by a few miles (naturally), so I had to buy a new one. However they gave me a deal and I am a happy camper.