Get the storage location of Powerpoint Mac add-ins

Question

I need to add a PowerPoint add-in to Powerpoint Mac from my cocoa application. I am already adding a .ppam file from a cocoa application through the code below

 NSString *pluginPath = [[NSBundle mainBundle] pathForResource:@"Kahani2016" ofType:@"ppam"];
    [[NSWorkspace sharedWorkspace] openFile:pluginPath];

Works with most PowerPoint. We can view the added powerpoint add-on from powerpoint.

But some systems. It shows below error message

I am trying to fix this problem. I tried to fix this problem by adding a digital signature with the .ppam file. but this does not help to solve the problem. I was just embarrassed because I tried to recreate this problem on another machine with the same OSX and Powerpoint version, but it works fine on another machine. My Powerpoint 15.29.1 Mac Settings

, powerpoint-Addin, .