If the SSL certificate on your server is not configured correctly, Android users may see an authorization error when they try to sign in to the Bitrix24 mobile app.

If you see the error The application is trying to access a server with an untrusted certificate, check the server certificate chain configuration.

You can use an online SSL/TLS diagnostic tool, such as SSL Labs, to check the server configuration. Enter your server address and click Submit.

Check the Additional Certificates (if supplied) section. If you see the Chain issues warning, the server is missing an intermediate certificate in the certificate chain.
Most certificate authorities provide setup instructions for common web servers. For more information, contact your SSL certificate provider.