A canonical tag is an HTML tag that normalizes page URLs with similar or duplicate content. For example, if multiple URLs are set for one page, such as with or without www, this will increase unnecessary crawling and important pages will not be indexed, leading to a decrease in the quality of the site. For important pages, be sure to normalize the page URLs with canonical tags in advance.
For more information on canonical tags, please also see the following article:
Reference: The necessity of canonical tags and how to use them
Access is restricted by robots.txt
Robots.txt is a file that tells crawlers which files they want to read. If you restrict accounting directors mailing lead crawler access with robots.txt, the crawler will not be able to crawl and the site will not be indexed. If "disallow" is written in robots.txt, the crawler will not crawl.
Disallow: / Deny all URLs
Disallow: /mypage/ Deny URLs under the /mypage/ directory and allow everything else
Disallod allow all others
Check to see if there is any "disallow" in the file. If there is, delete it and upload it again.