Problem with timer switch

[DieterBlette]

Hi all, thank you for providing the script. Thank you also for the update to have a possibility to use it for several Bayernlüfter devices. Unfortunately I have a problem using the timer button. Every time I try to use the time button via the overview in HA I get the information "Failed to call service switch/turn_on" (or "..._off"). But the timer of my Bayernlüfter devices are working fine if I call the timer button directly using a service via the developer tools in HA. Anyone having the same issue? Any idea how to solve it?
Best regards