Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience that might have been caused due to that.
Please note that it is completely up to Google if they want to index or not index your website. So, if you haven’t willingly or accidentally made your posts noindex and Google still isn’t indexing your page – it means that either Google doesn’t want to index or hasn’t crawled your page yet because it hasn’t allocated that much crawl budget to your website.
Please check this website for more details.
For Rank Math, there are a few things you must check for in order to see why the posts aren’t getting indexed.
1. Make sure the post is not selected as ‘noindex’ in WP > Posts > Your Post > Advanced Tab in Rank Math.
Screenshot:

2. Ensure that the noindex is not selected for Global or Posts meta:

3. Check the sitemap settings and check if the posts are setup to be included in the sitemaps:

We do have a separate Google Indexing API plugin that you can try out.
https://rankmath.com/blog/google-indexing-api/
Please note that Google recommends that you use the Indexing API ONLY for Job Posting and Live Streaming websites.
During our tests, we found that it works on any type of website with great results and created this plugin for testing. Perhaps you can try this out and see if it works for you.
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.