Just had a talk with @Akhil_Kulkarni on an Office Hour. I could not debug it myself, so asked Akhil to follow up here.
They are using a set of dependent dropdown custom field. Ticket update fails only when a particular field “Location A” or “Location B” is updated. The error message is generic, and difficult to debug. Code to make requests looks normal.
There is also a support ticket: https://support.freshservice.com/support/tickets/11312669.
@Santhosh any ideas?
@Akhil_Kulkarni Can you post the error message and if possible a screenshot of the custom fields here?