Unable to get custom Teams app supported in shared channel

Hello everyone,

I'm developing a Teams app which is working fine apart that I cannot the app supported in Teams shared channels. 

The app is a configurable tab app with no bots and no personal / static tabs

Here is my manifest file:

{
    "$schema": "https://developer.microsoft.com/en-us/json-schemas/teams/v1.23/MicrosoftTeams.schema.json",
    "manifestVersion": "1.23",
    "version": "1.6.5",
    "id": "135a5af5-6bf3-XXXX-XXXX-XXXXXXXXXXXX",
    "developer": {
        "name": "COMPANY",
        "websiteUrl": "https://www.company.com/",
        "privacyUrl": "https://www.company.com/privacy",
        "termsOfUseUrl": "https://www.company.com/termsofuse",
        "mpnId": "XXXXXXX"
    },
    "icons": {
        "color": "color.png",
        "outline": "outline.png"
    },
    "name": {
        "short": "APP name",
        "full": "Full app name"
    },
    "description": {
        "short": "A useful configurable Teams app",
        "full": "useful Teams app"
    },
    "accentColor": "#FFFFFF",
    "configurableTabs": [
        {
            "configurationUrl": "https://app.example.com/setup",
            "canUpdateConfiguration": true,
            "scopes": [
                "team"
            ],
            "context": [
                "channelTab"
            ]
        }
    ],
    "supportedChannelTypes": [
        "privateChannels",
        "sharedChannels"
    ],
    "webApplicationInfo": {
        "id": "e11ad337-b136-XXXX-XXXX-XXXXXXXXXXXX",
        "resource": "api://app.example.com/e11ad337-b136-XXXX-XXXX-XXXXXXXXXXXX"
    },
    "bots": [],
    "composeExtensions": [],
    "permissions": [
        "identity"
    ],
    "validDomains": [
        "app.example.com"
    ]
}

Does anyone have a similar issue?

I've also tried to recreate the app using the Teams Developer Portal, but with no luck.

Thank you

Tobias