Test users can't install or use a google chat app

[orangePen]

How can I allow tests users from outside  my workspace (different email domain) to use my chat app?

- The Chat app was created in google apps script and linked to a GCP project, the app works but just for users in my workspace 

Hi, I have a google chat app that is going to be used by people in my workspace and some users with gmail.com accounts, I've added all the users to the test users lists but still only people inside my workspace are able to use the app, users with gmail.com account can't install the app (they don't see it listed) and clicking on cards buttons does nothing, I have tried publishing the app but one of the recommendations from google is this:

1. If your application is for Personal use only:

The app is not shared with anyone else or will be used by fewer than 100 users. Hence, you can continue using the app by bypassing the unverified app warning during sign-in. It is recommended, however, that your project’s publish state is set to testing and continue to use your app under testing mode.

Which exactly describe my app and requirements

[Penelope]

Definitely not an expert or anything but Stack overflow might know since it's a more technical community at times and have you tried any of the options to contact support in https://developers.google.com/chat/support....

I know that the onClick Card mentioned in https://developers.google.com/chat/api/reference/rest/v1/cards says that

card

object (Card)

A new card is pushed to the card stack after clicking if specified.

Supported by Google Workspace Add-ons, but not Google Chat apps" which makes me wonder if some of those items are only for Workspace users and only works for them but not @ gmail.com users.