Here’s a potential way around proxy / method to use a qr code to authenticate for nvsdkmanager.exe
You could try following to see if it helps.
# In powershell or cmd/Command Prompt
copy "C:\Program Files\NVIDIA Corporation\SDK Manager\responsefiles\Windows\sdkm_responsefile_sample_jetson.ini" $HOME
# Edit it and add your values.
notepad sdkm_responsefile_sample_jetson.ini
# To download jetpack 7.1 run
NvSDKManager.exe --cli
# Then install Jetpack with
NvSDKManager.exe --cli --response-file ./sdkm_responsefile_sample_jetson.ini
# Or this
NvSDKManager.exe --cli --action install --login-type devzone --product Jetson --version 7.1 --target-os Linux --host --target JETSON_AGX_THOR_DEVKIT --flash