Home Connect ALT integration (NEFF devices)

Wonder if anyone could help me please.
Realtively new to HA and using it mostly for Energy readings, but starting to branch out and see what else i can do.

I am trying to integrate a NEFF device. From reading up it appears to use the Home Connect HACS integration, as available here

I have completed the install, up to the point where i do the main integration. Having completed all the API details on their website and inputted this data into the configuration.yaml, when i try to integrate it just throws an error webpage, stating an ‘invalid request’

The GitHub site just says you havent followed the instructions correctly, but i have been over it several times now and cant see what bit i might be getting wrong.

Any ideas plesae?

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same situation with Boasch device