...
401 Error during Synchronization
Issue 1: If you are encountering a 401 error during synchronization, the issue may be related to the accuracy of your login and password in the "Beesender chat configuration" section.
...
Re-enter the login and password in the "Beesender chat configuration" section.
Save the changes to the section.
Attempt to synchronize again to ensure that the updated login and password have been properly applied.
Issue 2: BPMCSRF token option is disabled in your system
Solution:
If you are using an On-site system, contact your IT specialists and request that they enable the BPMCSRF token option in the CRM system settings on the server.
If you are using a Cloud system, contact Creatio technical support and request that they enable the BPMCSRF token option for your system.
404 Error during Synchronization
...