Solved it!
I had Tado V1.1.3 active and when I saw your version (3.1.13) I concluded mine needed an update. So I dumped my app and reloaded it through Homey. I immediately saw that the version was still the same, so your app had to be a developer version. BUT … my new app appears to work.
So thank you, you put me on the right track.
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