If the Clever Fon App shows that your Fritz!Box is incompatible, that’s probably because it doesn’t meet the necessary technical requirements. It could be that the phone book function is not supported. Your Fritz!Box is probably a little older, or a cut-down model without the necessary phone book function. It may help to update your Fritz!Box with the latest software update:
– Open the Fritz!Box user interface. To do this, enter “http://fritz.box” in your Internet browser.
– Click on “Assistant“
– Start “Update” or “Update Firmware”.
If your repeater is shown as incompatible, that’s because repeaters don’t support phone books. However, you should still be able to connect your Fritz!Box.