The activation of this (amber yellow) "warning" indicates that the hands free system has detected that the battery that permits the active key (1, fig. 62) To communicate and turn the vehicle on is almost discharged.
Note
In this case, ducati recommends replacing the battery as soon as possible as described in the paragraph "replacing the active key battery" (page 88).

Hands free key (hf) not recognised
High engine coolant temperatureScheduled maintenance chart
Operations to be carried out by the dealer
List of operations to be performed at 1000 km
Reading of the error memory with dds on the engine control units, vehicle and
abs
Change the engine oil
Change the engine oil filter
Check the indicators and lighting
Check the safety devices (side stand ...
Key-on/key-off using the red key on the handlebar with the active key
A key-on can be performed by pressing the red key (6) on
the handlebar in the hands free on/off position and in
the presence of the active key (3, fig. 77).
Note
The active key (3, fig. 77) Has a range of approx. 1.5 M,
therefore it must be located within this range.
Key-off can be performed ...
Refitting the exhaust system
Refit the heat guard on the manifold (10) by tightening the nuts (9) to a
torque of 10 nm +/- 10% (sect. 3 - 3, Frame
torque settings).
Position the vertical exhaust manifold (22) on the vertical cylinder head
with the gasket (23).
Tighten the fixing nuts (21) to a torque of 10 nm +/- 1 ...