Outlook 2016 Web Add in Desktop - outlook

I have created a project for an outlook web add-in. I can see the web add-in in the browser UI, and click everything appears to be correct.
However I cannot view it on the desk top version of outlook 2016. The directions say:
1. Open the Office Store, either in Outlook 2016 for Windows or Outlook on the web:
- In Outlook 2016 for Windows, choose the Store button on the Home tab.
- In Outlook on the web, choose the gear icon in the upper-right corner, then choose Manage integrations.
2. Click the text Click here to add a custom add-in.
3. Choose Add from file....
4. Browse to and select the tw-email-manifest.xml file from the root of the project folder, and then choose Open.
5. Review the warning prompt and choose Install.
6. Close the Office Store window. Your add-in will load in Outlook.
Followed the directions for Outlook on the web but when I get to In Outlook 2016 for Windows, choose the Store button on the Home tab. it directs me to the Office 365 Link https://store.office.com/en-us/appshome.aspx?productgroup=Outlook&ui=en-US&rs=en-US&ad=US
Anybody with ideas. When I use a default setup project out of VS 2017 everything runs fine, but attempting to create the project using Microsoft Office Add-in Project Generator - YO OFFICE! It will not have a MVC back end.
The direction came from this link
https://learn.microsoft.com/en-us/outlook/add-ins/addin-tutorial

Instructions on how to sideload in Outlook 2016 desktop are here
If this doesn't work for you, you can still sideload from Outlook on the Web

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Adding screenshots of the same.
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First of all, you need to check the manifest file for any ribbon UI customizations. If ribbon buttons are not listed there, you will never find them on the UI.
Also checked the disabled and inactive addins but the taskpane is nowhere to be found.
It seems you have checked the list of COM add-ins, not web add-ins in Outlook. On the Home tab you may find the Get Add-ins button which opens the Add-ins dialog where if clicking on the My Add-ins tab on the left side of the window you may find your add-in listed. If it is not listed there you need to add it by pointing to the manifest file. Before doing that you need to make sure the web server where the add-in is hosted is running and files are accessible.

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If I click manage button I get the popup with error.
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Update:
Screenshot about COM addins:
I have also a custom forms installed!

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