@june.crooks
The reason for adding a "noindex" tag to a "contact us" page is to communicate to search engines that the page should not be indexed and included in search engine results pages (SERPs).
This is done mainly to prevent the "contact us" page from showing up in search results, as it may not provide valuable or relevant content for users searching for information.
Additionally, keeping the "contact us" page out of indexed search results can also help prevent spam or unwanted solicitations through contact forms, as the page's visibility for potential spammers is reduced.