Unexpected Sigenergy Cloud token response: {'code': 11003, 'msg': 'authentication failed', 'data': None}

Hi.

I have this simple program based on your example:

import asyncio

from sigenergy_cloud import SigenergyCloudClient

async def async_main():
    client = SigenergyCloudClient(username="[REDACTED]", password="[REDACTED]", region="apac")
    try:
        await client.connect()

        flow = await client.energy_flow()
        mode = await client.current_operational_mode()

        print(f"Energy Flow: {flow}")
        print(f"Operational Mode: {mode}")
    finally:
        await client.close()


if __name__ == "__main__":
    asyncio.run(async_main())

It always throws this error:

Traceback (most recent call last):
  File "/root/repositories/seud0nym/sigenergy2mqtt/tests/utils/cloud_test.py", line 21, in <module>
    asyncio.run(async_main())
    ~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/root/.local/share/uv/python/cpython-3.14.7-linux-x86_64-gnu/lib/python3.14/asyncio/runners.py", line 205, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "/root/.local/share/uv/python/cpython-3.14.7-linux-x86_64-gnu/lib/python3.14/asyncio/runners.py", line 128, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/root/.local/share/uv/python/cpython-3.14.7-linux-x86_64-gnu/lib/python3.14/asyncio/base_events.py", line 720, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/root/repositories/seud0nym/sigenergy2mqtt/tests/utils/cloud_test.py", line 9, in async_main
    await client.connect()
  File "/root/repositories/seud0nym/sigenergy2mqtt/.venv/lib/python3.14/site-packages/sigenergy_cloud/client.py", line 67, in connect
    await self._auth.authenticate(
    ...<4 lines>...
    )
  File "/root/repositories/seud0nym/sigenergy2mqtt/.venv/lib/python3.14/site-packages/sigenergy_cloud/auth.py", line 82, in authenticate
    self._tokens = await self._request_token(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<8 lines>...
    )
    ^
  File "/root/repositories/seud0nym/sigenergy2mqtt/.venv/lib/python3.14/site-packages/sigenergy_cloud/auth.py", line 131, in _request_token
    raise error_type(f"Unexpected Sigenergy Cloud token response: {payload!r}")
sigenergy_cloud.errors.SigenergyCloudAuthError: Unexpected Sigenergy Cloud token response: {'code': 11003, 'msg': 'authentication failed', 'data': None}

I have double checked that the region is correct and that the credentials work on the mySigen web app (https://app-aus.sigencloud.com/). The same username/password also works on the Developer Portal.

I also tried your HACS integration, and I get Invalid username or password when trying to initially connect.

Do you have any idea why I can't connect?

Thanks.

Reproduce the failure with the example in tests/utils/cloud_test.py, then read sigenergy_cloud/client.py and sigenergy_cloud/auth.py, especially authenticate and _request_token. Compare the reported token payload with the credentials and region used against the mySigen web app. Done means identifying why valid credentials receive code 11003 and adding a verified fix or documenting the required authentication details.