Can't provision new devices

I've added one device, but I can't provision additional devices, either desktop or mobile. The GUI interface just shows "Device provisioning failed because this device went offline," despite this not being the case. Similarly, the command-line interface shows:

Enter the verification code from your other device here.  To get
a verification code, run 'keybase login' on your other device.

Verification code: <removed>
- ERROR {-} Error in transport: msgpack decode error [pos 0]: API network error: doRetry failed, attempts: 5, timeout 10s, last err: context deadline exceeded


OK Verification code received.

- ERROR {-} Error in transport: msgpack decode error [pos 0]: API network error: doRetry failed, attempts: 5, timeout 10s, last err: context deadline exceeded
- ERROR API network error: doRetry failed, attempts: 5, timeout 5s, last err: context deadline exceeded (code 1601)

my log id: 4617792a5b4cee13ac0a8a1c

Reproduce device provisioning through both the GUI and command-line interface, using log id 4617792a5b4cee13ac0a8a1c and the displayed transport timeout. Start with the keybase login verification-code flow; done means additional desktop and mobile devices provision successfully without the offline or API network errors.