Sign In button stopped being shown in MS Teams

Good afternoon,

Today we encountered the issue: the Sign In button stopped being shown within the Sign In prompt of OAuthPrompt class:

We use this class for SSO in MS Teams in our solution for several years without any issues and changes. The implementation is done exactly as suggested in samples and according to documentation from the links below:

https://learn.microsoft.com/en-us/javascript/api/botbuilder-dialogs/oauthprompt?view=botbuilder-ts-latest 

https://github.com/microsoft/BotBuilder-Samples/blob/main/samples/javascript_nodejs/18.bot-authentication/dialogs/mainDialog.js

Here is our code:

        // Prompt for OAUTH

        this.addDialog(

            new OAuthPrompt(ComponentDialogConstants.OAUTH_PROMPT, {

                connectionName: process.env.MS_CONNECTION_NAME,

                title: 'Sign In',

                timeout: 300000

            }));

The productive usage of our clients' integrated bots is affected. The issue is reproduced in all the environments for old, new version of MS Teams and in Web, so there is no workaround. Therefore please consider this issue with the priority very high.

Thank you,

Best regards,

Darya