Predictive code completion is not supported in this region

I'm using beta 2 of Xcode 16 on an M1 MacBook with 32 GB of memory, running macOS 15 beta 2. It didn't appear that predictive code completion was working as exhibited in the developer videos, so I tried to figure out what's going on. The Xcode documentation mentions that you can disable predictive code completion in Settings, so I checked there. The checkbox to turn it on is disabled. When I click the "I" button to its right, it tells me that "Predictive code completion is not supported in this region." I am in the US with my system set to US English. What do I have to do to be able to experience this feature?

I saw that this has to do with being on external drive, but a fellow developer has it working on his external drive, he lives in AZ, I am in CA, so this is not making sense. One difference is he has a Mac Mini and I have a Studio with a M1 Max and 64Gb.

I am also running on an external SSD and get the same error

Predictive code completion is not supported in this region
 
 
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