You could get logs of internal errors on the Office Addin using following method. Its simple and easy and involved few steps achieve.
Open Windows registry editor (windows + R then regedit.exe) and follow the route "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Wef\Developer\" and mention your location to write logs.
Notes
Runtime logging feature available in Office desktop 2016 version.
You must be admin of the considered system to perform this.
Important!
Initially, this is kept blank and keep in mind to reverse it back since it leads to performance issues.
Open Windows registry editor (windows + R then regedit.exe) and follow the route "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Wef\Developer\" and mention your location to write logs.
Notes
Runtime logging feature available in Office desktop 2016 version.
You must be admin of the considered system to perform this.
Important!
Initially, this is kept blank and keep in mind to reverse it back since it leads to performance issues.