Exchange rate always updating to “1”

On the Product Price tab, the Exchange Rate field is always updating to “1”, whereas it should be “5.26” now. I’m using the Yahoo Finance rate API, which is the same as the one I’m using in the “WOOCS – WooCommerce Currency Switcher” plugin. But in this plugin the conversion rate is coming right. What could be wrong?

By the way, I found a topic with the same title, but I couldn’t access the answers. The site says I’m not authenticated and I can’t enter the topic as it always redirects to the login screen.