Notification bot not detecting any installations

Hello,

I created a teams notification bot using Teams Toolkit on VSCode (https://learn.microsoft.com/en-us/microsoftteams/platform/toolkit/teams-toolkit-fundamentals?pivots=visual-studio-code). I selected http trigger through a restify server.

Before that, I created an app on Azure for the bot and generated a secret, and I created a bot on the Bot Framework (https://dev.botframework.com/bots) that uses the app ID of the previously created app.

I filled in the credentials of the bot in the manifest template and in `initialize.ts` (file generated by Teams Toolkit initializing the bot). The code that I have is basically the code generated by Teams Toolkit, I did not change anything besides the credentials for the bot and the manifest.
I then started the app in a terminal with npm, zipped the manifest and uploaded it as a custom app on teams. It opens a tab with a chat with the bot on teams, it just needs the http trigger to send me a message. When I send a POST request to http://localhost:3978/api/notification I can see the query working but the code that checks for bot installations and send an adaptive card to them returns nothing (`bot.notification.installations()` is empty), as if no one installed the bot, but I did. I tried using ngrok to create a tunnel but it does not change anything.

What am I doing wrong ? I want to try the bot when it is running with node locally as later I'll need to implement it in an already existing node express app.

Thank you for your time.