Sonos Binding channel batterylevel UNDEF

Hi,
last year I build a rule with checks the batterylevel of my Sonos Roam and if level is low the speaker gives a warning. The rule was running fine.

Yesterday I started the speaker again and find out, that the thing “batterylevel” is still UNDEF. All other channel are working fine.

I tried to re-create the thing new, but still get no update on channel batterylevel.

Enyone else is working with sonos batterylevel?

regards
Björn