Issues with deploying application to Flex Consumption Apps

I have an Azure DevOps Pipelines "AzureFunctionApp@2" task which works fine for normal Consumption Plans. However, when I try to deploy to FlexConsumption Apps this does not work. I have added "isFlexConsumption: true" to the task, but I get the following error:

##[error]Failed to deploy web package to App Service.

##[warning]Can't find loc string for key: KuduStackTraceURL

##[error]KuduStackTraceURL https://funcname:***@funcname.scm.azurewebsites.net/api/vfs/LogFiles/kudu/trace

##[error]Error: Error: Failed to deploy web package to App Service. Not Found (CODE: 404)