Official Sonos app gave up, after provider change

I get the approach.
Pretty sure (you never know) I did follow the rules.
No errors (..request took xy ms).

No success.
Homey Pro (2026)
Version 13.1.5

However, maybe a Version specific thing.

Scrolling in the feed, I saw [APP][Pro]Flow Converter - Apps - Homey Community Forum - which did it with not trouble.

Can only thank both authors and @smarthomesven for the hint.

Cheers,
Ralf