Hi Marco
From MS guys Mohamad and Horia, and is this is working
In the launch.json, please specify the following as well:
"sandboxName": "SandboxGB",
"tenant": "c1e6e092-68e7-4999-af96-25fa2a0207b7",
If you have a unique name for your sandbox environment, specify that in sandboxName and also tenant ID in the tenant configuration like above.
Once you do this, clear the cached credentials, and Download Symbols again. Authenticate and it should download them successfully.