@Ally Adamson Diagnosing the issue may be dependent on figuring out a more specific server error that SEMRush is getting.
You could start with Google's URL inspection tool to identify obvious indexing issues.
If SEMRush can't provide a specific server error/status code (401, 500, etc), then you could try to recreate the error. The most straightforward way would be to make a GET HTTP request to the URL and set the user-agent request header for a web crawler.
If you aren't comfortable with cURL requests or terminals, I'd recommend Postman as a more user-friendly interface.
For me personally is a waste time trying to do this by yourself. I am at the IT faculty, and a friend of mine asked to do some seo for his fresh website. At first, it semmed easy, just posting some comments on forums with links in it. I've tried so many ways, apparently I needed more tools than I thought. The SEMRush wasn't working, the robots.txt codes as well. At that moment I was ready to give up, when I accidentally found the malaysia seo service which provided a highly effective search engine optimization for a low price actually, for a quick start up in online business this is the best option I found on internet
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