Ah, that is from this Help Site…
It seems that means, the URI will only then be transmitted to the Bitwarden app, when the other app permits that transfer. – But I’m not an iOS user and can only speculate.
In what form did you add the bundle ID? – Based on this older comment it should work with https://... on iOS. 
If I understand you correctly, sometimes autofill does work for you? However, I would recommend having a look into the general guide for autofill on iOS as well (again?): Autofill From iOS App | Bitwarden