Bitrix24 controls duplicate only using a standard phone and email fields.

ChatApp generates a non-existent email for Telegram contacts because The username of a Telegram account is not taken into account by the CRM system to control duplicates. To prevent duplication of contacts and leads, ChatApp uses a non-existent email containing the username of the contact, for example, anton3088@telegram.chatapp.online

Disable option for Telegram connector (contacts and groups).

Disable option for WhatsApp connector (group)

• To avoid duplication of leads and contacts, we use a non-existent email containing the group id, for example,
  group-766680019@telegram.chatapp.online
  120363044032072866@g.us
• In this case, duplication of leads and contacts will not occur.
• If you will never use the ChatApp robot in Bitrix24 to create groups, disable the creation of a non-existent email.

How to install the ChatApp app from the Bitrix24 market →

How to connect ChatApp channels to Bitrix24 open line →

Benefits of integrating ChatApp messengers →

How to synchronize Bitrix24 contacts with a mobile device →