Thanks for asking question! If I am understanding right you are using 2020-06-30-Preview.
Could you please try upgrading to 2021-04-30-Preview and then using semanticConfiguration
or use searchFields
instead of semanticConfiguration
.
As its mentioned in here:
More details: https://learn.microsoft.com/en-us/azure/search/semantic-how-to-query-request?tabs=semanticConfiguration%2Cportal
Let us know if issue remains or further query on this.