You can easily connect the Bitrix24 mobile app without login and password if you are already authorized in the web version or in the Bitrix24 app for Win and Mac.
Open the user widget and click Show QR code.
Scan the QR code with your mobile camera.
You will be automatically authorized in your account in the Bitrix24 mobile app.
If there are not Google services on your mobile device, there may be some limitations in the Bitrix24 mobile app.