Version

SDK Platform: C#
SDK Version: Bot Builder 4.21.0
Active Channels: Teams
Deployment Environment: Azure Bot Service

Describe the bug

404 NOT FOUND when trying to GET the user token from teams with this request:
https://api.botframework.com/api/usertoken/GetToken?userId={user-id}&connectionName=BotOAuth&channelId=msteams
When using my own id I can get a token, but my colleagues cannot, when I send them a link to "test connection" from the Azure Bot page, they can get their token perfectly fine.

Expected behavior

It should return 200 with a token, just what happens with my user-id or return a prompt to allow access?

Additional

I am using the AdapterWithErrorHandler : CloudAdapter with base.Use(new TeamsSSOTokenExchangeMiddleware(storage, configuration["ConnectionName"])); and the main code can be found below. The tokenResponse is null due to the internal request getting a 404 NOT FOUND response.

protected override async Task OnMessageActivityAsync(ITurnContext<IMessageActivity> turnContext, CancellationToken cancellationToken)
{
	var userTokenClient = turnContext.TurnState.Get<UserTokenClient>();
	var tokenResponse = await userTokenClient.GetUserTokenAsync(turnContext.Activity.From.Id, _connectionName, turnContext.Activity.ChannelId, null, cancellationToken).ConfigureAwait(false);

	if (tokenResponse == null)
	{
                // Tried this, but this should be needed when using sso?
		var oauth = new OAuthCard(text: "test", connectionName: _connectionName, new List<CardAction>()
		{
			new CardAction(type: ActionTypes.Signin, title: "test")
		});
				
		await turnContext.SendActivityAsync(MessageFactory.Attachment(oauth.ToAttachment()));
                return;
	}
        // Other code here that needs the tokenResponse
}

Azure config: