Currently, I faced a weird problem, I was trying to implement an App solution into a customer catalog, but every time I tried to deploy the solution, it was impossible to be deployed.
The weird thing here, that I have a development tenant, were I am able to deploy the app without problem, so I was struggling into it to discover what was the real problem.
So after deploying several time the app into the catalog, I accessed to the “Integrated Apps” inside Services, and I realized that this was turned off. So… after turning on this feature I was able to deploy correctly the app and the problem was solved.
For more info for how to turn on the the apps: https://docs.microsoft.com/en-us/office365/admin/misc/integrated-apps?view=o365-worldwide
Albandrod's Memory 
Hi there, the whole thing is going fine here and ofcourse every one is sharing information, that’s actually fine, keep up writing.|
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