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Thanks so much for the answer, Chris! Why are our help articles all out of index?

1. Honestly, main reason is that they have just always been that way from before I arrived at the company, and I've had a variety of other things I've prioritised ahead of addressing help center articles - especially seen as our marketing dept doesn't have any direct control/input over them atm.

2. Part of me would be concerned about creating duplicate content/cannibalization issues with other pages and posts from the main marketing site. There would be a lot of articles to go through in order to individually canonicalise to a preferred piece of content if the article presents a duplication issue with some other content on the site. Do you think this is a legitimate concern? Or am I overthinking?

We're a SaaS company and have a pretty extensive help center resource on a subdomain (help.domain.com). This has been set up and managed over a few years by someone with no knowledge of SEO, meaning technical things like 404 links, bad redirects and http/https mixes have not been paid attention to.

Every page on this subdomain is set to NOT be indexed in search engines, but we do sometimes link to help pages from indexable posts on the main domain. After spending time fixing problems on our main website, our site audits now flag almost solely errors and issues on these non-indexable help center pages every week.

So my question is: is it worth my time fixing technical issues on a help center subdomain that has all its pages non-indexable in search engines? I don't manage this section of the site, and so getting fixes done is a laborious process that requires going through someone else - something I'd rather only do if necessary.