It isnt clear to me based on the below

I believe cancellation of award LH flight costs 50 Euros, but is there a deadline in which you should cancel your award ticket (to avoid more fees or penalty)? like 48h before flight, 1 week before flight etc?

And am i right you must call M&M up to cancel the LH flight? cannot cancel online even though you previously book the award flight online ?

Thank you
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https://www.lufthansa.com/online/por...nodeid=2549891

2.3 Changes to bookings and cancellation
A charge of €50 per person (or the equivalent value in a foreign currency) will be made for rebooking or cancelling a flight award. You can only change the date and time of the flight when you rebook. It is not possible to change the route. Please note that rebookings or refunds may lead to additional charges for taxes, fees and surcharges.

At present, you can only cancel or (where permitted) change your flight award booked online via your local Miles & More Team.