I developed a Google Workspace add-on in Google App Script. I tried to test the add-on by follow this guide: https://developers.google.com/workspace/add-ons/how-tos/testing-workspace-addons, which says that:

Follow these steps to install an unpublished Google Workspace Add-on for testing:

Open the script project in the Apps Script editor.
Click Deploy > Test deployments.
Click Install.
At the bottom, click Done.

However, I do not see my extension in the “Managed add-ons”. Here is my manifest file:
{ "timeZone": "America/New_York", "dependencies": {}, "exceptionLogging": "STACKDRIVER", "oauthScopes": [ "https://www.googleapis.com/auth/script.container.ui", "https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/script.external_request" ], "runtimeVersion": "V8", "addOns": { "common": { "name": "Cohesive Extension", "logoUrl": "https://cohesive.blob.core.windows.net/extension/Freeform (2).png", "useLocaleFromApp": true }, "sheets": { "homepageTrigger": { "runFunction": "onOpen" } } } }

I expected to see my add-on in the Managed add-on list on Google Spreadsheet. I made sure the open the spreadsheet in my Google account and have tried to reset my browser cache + uninstall/install the add-on several times.