Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience caused.
The duplicate property does not affect Instant Indexing.
Can you please share a screenshot of the Raw Response from the Indexing API?

Click on Send to API and then click on the Show Raw Response button.
We look forward to helping you.
It is showing success with ,raw response url updated,and whenever i try to submit post urls on instant indexing dashboard ,the response always come 200 ,then i have to submit manually in gsc and that takes days to index
Hello,
Please note that Instant Indexing helps your website’s pages and content to be crawled instantly. Using Instant Indexing does not always result in the indexation of the content. It may take anywhere from minutes to days or even weeks before a URL is indexed. Using the Instant Indexing plugin doesn’t guarantee that your pages will show up in the search results.
Hope this helps.
Thank you.
thanks , i think there isnt any benefit of using it , if i have to submit post urls manually , atleast it should let the google search console to crawl post url, which the instant indexing fail to do so, when i submit through plugin , after hours of submitting , i go for checking url in gsc the url isnt even bieng crawled then i had to submit in google search console manually then there appears any chance of being crawling posts or index posts.
Hello,
If Google is not crawling and indexing your posts through Instant Indexing, it means that they don’t find your site eligible for the indexing API. Instead of manually submitting your URLs to the GSC account, you can submit your sitemap in your GSC account and Google will be able to discover and crawl the URLs from that.
Don’t hesitate to get in touch in case you need our assistance with anything else.