Google News RSS feeds often use encoded URLs that may not redirect properly with the Find Redirect Page function. [1]
Try a hard refresh first: Ctrl + Shift + R (Windows) or Cmd + Shift + R (Mac).
If the issue persists, click into the specific cells showing errors to see detailed error messages, which will help identify the exact problem with the redirect function.
Thanks for reaching out to support. Would you be able to point me to the column in your table you're seeing this issue, would love to take a closer look at what's going on.