az storage blob upload --data @- does not work

This works:

echo "Test" > test.txt
az storage blob upload --blob-url 'https:...' ...  --file test.txt

This does not, all other arguments the same

echo "Test" | az storage blob upload --blob-url 'https:...' ... --data @-

I have tried this in WSL, PowerShell and CMD, all give the same error:

Argument '--data' is in preview and under development. Reference and support levels: https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Faka.ms%2FCLI_refstatus&data=05%7C02%7Ckevin.english%40ipta.com%7C969ee98b283b430500b008dc132f1dfc%7C2173c860aa3c490f943fb3abf780ac80%7C0%7C0%7C638406340309297338%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=h%2FTNWMaCWIoF7DlvaQCAsgZSGpDyQ25eHkHwElVlkBY%3D&reserved=0
expected str, bytes or os.PathLike object, not NoneType

I really need this to work.

This is in

az cloud set --name AzureUSGovernment

with

az version

{
"azure-cli": "2.56.0",
"azure-cli-core": "2.56.0",
"azure-cli-telemetry": "1.1.0",
"extensions": {}
}