Unable to add uploaded app to a team - "UpdateBotTeamMember

[jimmymaise]

I'm trying to create a simple bot. I follow the below tutorial
https://assist-software.net/blog/how-create-python-serverless-ms-teams-bot

My schema is valid: No error in the JSON file
My zip file is valid: No other files, folders in a zip file

Still cannot add this application to team: Get error UpdateBotTeamMembershipInSkypeFailed
app.zip

I'm using a development account so I'm not sure if it is a problem? I downloaded an other sample application in the internet but has the same issue. My account is admin (at) wwhp0.onmicrosoft.com
Sample app: https://drive.google.com/drive/folders/18mljMbF-BwS1rci1SttFOlBVrF4hRlSS
My account created from this program: https://developer.microsoft.com/en-us/microsoft-365/dev-program

Here is the steps I have done:

• Go to Teams--> Developer Portal--> Import App
• Publish App, Try to click Prevew in Team but not successful (Manifest error )
• Go to Microsoft Teams admin center--> Approve the above App
• Come back Team-->Apps: Search the above App
• Click in it and select add to Team, select Team and channel
• Got error "UpdateBotTeamMembershipInSkypeFailed"

I also found that when I clicked in the Preview in Team, it also has Manifest error but not sure what's the error

after closing the below popup, i got an alert

[#2]

@jimmymaise -We are checking the issue. We will get back to you shortly.

[#3]

@jimmymaise - We tried to upload the zip shared in our demo tenant and it got added the team successfully. Could you please try to update your MS teams version and check once?

[#4 · Accepted solution]

Hello, I found the problem. Above tutorial forgot to mention that we need to add MS Teams as a channel of the newly created bot.
Anyway, the error is really confused. I think that it could be better if we have more meaning full error.

[#5]

Hello, Could you simply explain how to upload custom apps created by others?