MS Teams Bot SupportingCalls error

[Mohamed Sahbi]

I followed the series of @Tom Morgan  (https://blog.thoughtstuff.co.uk/2019/02/creating-a-microsoft-teams-ivr-bot-a-5-part-series/) to create an IVR Bot. When I upload the app to MS Teams and install it, I cannot call the bot. It appears that it does not support Calls, but I did check the box for SupportingCalls and the same thing was done in the Manifest of the app. 

Meanwhile, I did another sample with random AppId (it is not registered) following Microsoft official HelloWorld sample. When I switch between tabs, call/video/share screen signs appear. You can see it in the picture. 

Can someone help, please? Thanks

[#2]

@Mohamed Sahbi - Could you please share your App Manifest?

[#3]

@Wajeed Hanif Shaik  Here it is : 

{
"$schema": "https://github.com/OfficeDev/microsoft-teams-app-schema/blob/preview/DevPreview/MicrosoftTeams.schem...",
"manifestVersion": "devPreview",
"version": "1.0.0",
"id": "21bfd457-f116-4c9b-ad80-2fb9fcf5cd39",
"packageName": "dev.mohamedsahbi.com",
"developer": {
"name": "Mohamed",
"websiteUrl": "https://mohamedsahbi.com",
"privacyUrl": "https://mohamedsahbi.com/about",
"termsOfUseUrl": "https://mohamedsahbi.com/blog"
},
"icons": {
"color": "color.png",
"outline": "outline.png"
},
"name": {
"short": "Sample IVR ",
"full": "Sample IVR App"
},
"description": {
"short": "Demo app",
"full": "This bot is just made for demo purposes"
},
"accentColor": "#2E7AA2",
"bots": [
{
"botId": "21bfd457-f116-4c9b-ad80-2fb9fcf5cd39",
"scopes": [
"personal",
"team"
],
"supportsFiles": false,
"isNotificationOnly": false,
"supportsCalling": true,
"supportsVideo": false
}
],
"permissions": [
"identity",
"messageTeamMembers"
],
"validDomains": []
}

[#4]

@Mohamed Sahbi  You must enable developer preview mode