Obtaining extension identifier from Microsoft Edge add-on Web Store:

Lets consider 'adblock' as the extension to be added to the extension repository:

  • Go to Microsft add-on web store.
  • Search for the extension using the search bar.
  • From the URL address bar, select the extension identifier which is located after  "/" as displayed in the image below.
  • Copy the identifier and paste it in the Extension Identifier field present in the Extension Repository.