Tool does not find an existing sensor

[kwithus]

I do have a min/max-Helper sensor with the name sensor.aussentemperatur When I try to use this sensor as source for daily sensor, it always claims that one or more sensors do not exist and refuses to install the daily sensor Any idea?

[clydebarrow]

I have the same issue. When entering the sensor name, there is no drop-down matching what is typed as I would expect.