Upgrade to 2026.7.3: MyVaillant authentication stopped working

[rickb777]

The problem

After upgrading to 2026.7.3 today, the MyVaillant integration now shows that it needs repair. The authentication is failing. It was fine on the previous version. I checked the username and password are still OK.

What version of Home Assistant Core has the issue?

2026.7.3

What was the last working version of Home Assistant Core?

2026.7.2

What type of installation are you running?

Home Assistant Container

Integration causing the issue

MyVaillant

Link to integration documentation on our website

https://github.com/signalkraft/mypyllant-component

Diagnostics information

No response

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

No response

[rickb777]

This may be related to #177082

[AnLang191265]

Same problem for me

[NicolaMarcon]

Same problem also for me

[hartmuth59]

I have the same problem.

[home-assistant]

@rickb777 Hey, thank you for taking the time to report this! 🙏

The issue appears to be related to a custom integration and is not part of Home Assistant core.
Please report the issue directly in the issue tracker of the custom integration instead. Thank you for understanding! 😊

[rickb777]

The myvaillant authors have updated their integration this morning. This appears to have fixed the problem.