Our example.com and example.com/blog links to our web app at app.example.com. The issue is that app.example.com returns a 404 on an uncached load, but the correct page does load — it's a weird setup with our react app.
We see these errors in the Ahrefs site audit feature.
How can we still link to the web app URLs, but have Google's bot exclude those entirely to remove the 404 crawl errors?
It seems like we can add a disallow on the web apps robots.txt file, but I'm not confident this will remove the crawl errors for example.com + example.com/blog that we're seeing.