Notice the name of the token which is created as App keys in the function.
function GetFunctionToken { param ( [string[]]$funcResGroupName, [string[]]$funcName ) # Get function token $url = "/subscriptions/$subscriptionId/resourceGroups/$funcResGroupName/providers/Microsoft.Web/sites/$funcName/host/default/listKeys?api-version=2018-11-01" $functionCode = az rest --method post --uri $url --query functionKeys.appkeyName --output tsv return $functionCode }