The two companies have not completed the merger. The odds are looking unlikely given the time it has taken and the fact both the EU and US are looking at the deal with a lot of concern. XD is formally in maintaince mode, so critical bugs fixes or maybe updates due to OS updates, but that is it. Unless you have an All-Apps plan or the like you should be able to find it, but it seems to take a lot of noise to Adobe support to 'fix' having it show up.
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