ITV, Sky News, The Standard and El País contemporaneously identify Amanjena as the resort used for David Beckham's May 2015 birthday trip. Official Beckham family Instagram photographs visually document the celebration.
David Beckham stayed at Amanjena near Marrakech for his 40th-birthday celebration in May 2015. Contemporaneous reports from ITV, Sky News, The Standard and El País identify the resort, while Beckham and his family published photographs from the trip on their official Instagram accounts.
Source conclusion:
The cited sources support a stay at the named hotel.