Recently, I was working on creating a custom master page for Office 365 Application (SharePoint Online). I created Site and System Master Pages using Design Manager and customized as per the business requirements.
Issue – It was very interesting to see that when you create a custom master page using Design Manager, the “Add an App” Page will not show the complete list of apps or will not allow you to add the apps. Sometimes, you will see “Noteworthy” apps only or “Working on it” message.
How to Fix this issue:-
Make sure your master page includes the following placeholders and that each of them is not set to Visible=False. However, if you have implemented custom breadcrumb, you might need to hide any of the particular placeholders. For that, include a HTML element like <div> and apply the “style=display:none”, as shown below:-
Once I added the above highlighted code-snippet in system master page file, the Apps you can add started showing up again. 🙂
Hope this helps SharePoint developers 🙂