Azure Functions Timeout more than 10 Minutes doesn't work in App Service Plan

I have a scenario in which one of the functions which I am trying to consume might not return the result for more 10 minutes (depending on the response data). As I am not able to use the Consumption plan due to this, I tried using the App Service Plan with Basic tier (both B1 & B2). However, the function still errors out due to Timeout issue.

500 - The request timed out

Any pointers to solve this issue will be greatly appreciated.

Thanks