Syndicated from - https://d365demystified.com/2018/10/29/my-apps-missing-from-d365-sitemap/
At times, if you don’t see My Apps under Settings in your D365 SiteMap, fear not. Put this link in your URL with your Org details and you can simply land on the My Apps page.
https://<Your ORG URL here>/tools/AppModuleContainer/applandingtilepage.aspx
And you’ll be landed on the My Apps page that you would otherwise be able to access from the SiteMap itself (without the main Navigation Pane, though) –
Hope this quick tip is helpful!