Can´t activate Accessibility

I am trying to active the “Accessibility”-option (in German “Bedienungshilfe verwenden”). It is the second option in the Auto-Fill-Service-Menu. This option in deactivated in my Bitwarden-Android-App.

But when I click on the control to active this option, I will get forwarded to settings menu / accessibility, then I click on “downloaded services” and then on “Bitwarden” and I see, that IS activated.

So why is it shown as deactivted in bitwarden and when I try to use the AutoFill-Shortcut-Button it tells me, that Accessibility must be activated…