inbound integration to Oracle for Work order creation is not working post upgrade

Summary:

HI, Our instance got upgraded to 24B on 20th Jun, the inbound integration worked for sometime post upgrade and from 24th Jun, the same is not working.

Content (please ensure you mask any confidential information):

The integration is through rest api, and there is a OIC scheduler used to get triggreted to create the work order, which is not getting triggred now post 24th Jun.

We are trying to run the work order creation API from postman and we are getting error 'The flexfield segment faAreaCode with value  is duplicated in the list of values.', where as the value is existing in the value set.