Cannot connect to Vaillant Integration anymore

[PaulC1965]

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Before submitting a new issue

• [ ] I'm using the latest version of myPyllant: YES V0.8.22
• [ ] I've checked known issues: YES
• [ ] I'm sure this problem is about the myPyllant library. For issues with the home assistant component, open an issue here

Problem description

Since this morning 6 am my Vaillant app is not connecting anymore. The straight myVaillant app is still working fine as is my thermostat, so no problem there. Only issue is the Integration of Vaillant app through HACS in Homeassistant Green. I see in my HACS integration there is something wrong with the Vaillant app: It shows it needs attention.

In the configuration all seems OK however there is no hub connection. So I try to reconnect that one:

When trying to enter a wrong username or passcode I get a clear message there is something wrong with either of the two. When entering the correct username and passcode I just get below message saying there is an unexpected error. There is no explanation what the error is.

One thing I must say: yesterday evening I had for some reason to change the passcode of the myVaillant app itself. That one is working fine as I mentioned but the integration is not... even though I am using the new passcode correctly.

I have been using the Vaillant integration since July 2024 and it works flawlessly. It is the first time I encounter this issue and I do not seem to be able to fix it. I already reinstalled a full back-up this morning.... without success... the problem is still there. I did not try to remove the Vaillant integration yet as then I will lose all of my automations, scripts, ... as well that make use of one or more of the entities. So I'm careful here.

Any suggestions of what I may try next to fix this?

Thanks much and kindest regards,

Paul