Prerequisites
Microsoft 365 Configuration (as an administrator)
Teams Configuration
On the left menu, click "Show all" to expand all options.
then in the Admin centers section Click Teams
Under Teams App click Setup policies
then click on the Global (Org-wide default) policy to select it (or use/create a different policy)
In the Global (org-wide default) policy (or else), enable the Upload custom apps option
flexEZ App Upload
Under Teams App click Manage apps
On the right top corner, click Actions and select Upload new app
In the next screen, click Upload and select the manifest.zip file provided by your flexEZ representative
Click on this link to manage the successfully added app
The app is now installed and deployed on your Teams organization. Click on Permissions to manage the app permissions.
Click on Grant admin constent to make the app available to all users (or specified users if any restrictions applies - cf. Users and groups)
Select your admin account and click Accept when prompted
The flexEZ app is now ready to use for users in your Teams organization.
Additionally, but optional, you can also customize the policy to add and pin the flexEZ app to the users.