Cannot change Feed URL

I have created a feed using feed combiner from FeedSpot.   All the topics are working so I tried to change the Events category feed url using the same method.   However when I try to replace the current url with the FeedSpot url it says site cannot be reached.   I have cleared the cache and tried doing this from incognito windows on different browsers with the same results.   How do I correct this?  https://ashevillelocal.net/asheville-events-lifestyle/