I am sorry, Augustin, but Adobe XD was never available as part of the Photography plan. For information on what is included in your plan, see https://www.adobe.com/creativecloud/photography/compare-plans.html. If you wish to use Adobe XD, then please upgrade to Creative Cloud All Apps plan as suggested by Nancy. For more information on the additional features and applications included with a Creative Cloud All Apps plan, see https://www.adobe.com/creativecloud.html.