You don’t sate which version of Moneydance you are using. The following was tested using 2019.3(1870).
There are two methods within Moneydance for obtaining security prices automatically.
The extension “Quote and Exchange Rate Updater found under EXTENSIONS – MANAGE EXTENSIONS. It does not look like IEX Trading supports your two example funds.
Alpha Vantage does support your two example funds, but is very, very slow. Also, it has a bug which can mislead you into thinking a zero price is being returned. See screen shot and note $0.00. In fact prices are being returned.
If the Quote and exchange rate updater does not work well for you try the free third-party Quote Loader. Both of the sources in the Quote Loader return prices for your example funds. See screen shot