Module stuck on "Laden..." despite correct config (DATA FAILED, refreshing token)

[Schwabe71]

Hello,

I am having trouble getting the MMM-Netatmo module to work. It is permanently stuck on the "Laden..." (Loading...) screen.

I have tried every possible solution for many hours, but the problem persists. The developer console shows the final error: DATA FAILED, refreshing token.

This is what I have already done:

1. Confirmed my config.js is 100% valid using npm run config:check.
2. Updated the module to the latest version by deleting the folder and re-cloning it from GitHub (git pull also confirmed it's up-to-date).
3. I am using the correct new configuration structure with the separate auth: block.
4. I have created a completely new app in the Netatmo Dev Portal multiple times.
5. I have generated new tokens multiple times, ensuring the read_station scope is selected.
6. I have tried all variations of the refreshToken (the full token, the part before the |, and the part after the |). The error in the console remains the same.
7. The moduleOrder is set correctly with the exact names of my modules from the Netatmo app.

This seems to be a deeper issue with the token validation process. The module correctly identifies that the token needs to be refreshed, but the refresh process itself seems to fail silently on the server-side.

`My Configuration:

(I have replaced my secret keys with placeholders)

{
    module: 'netatmo',
    position: 'top_center',
    header: 'Netatmo',
    config: {
        refreshToken: 'PART_AFTER_THE_PIPE', 
        moduleOrder: ["Innenstation WZ", "Außenstation", "Innenstation AZ", "Regenmesser", "Windmesser"]
    },
    auth: {
        clientId: 'MY_CLIENT_ID',
        clientSecret: 'MY_CLIENT_SECRET'
    }
}`

Could you please look into this? It seems I have exhausted all user-side troubleshooting steps. Thank you!