Hello,
Thank you for contacting Rank Math.
I checked the URL, the page is correctly set to index and is appearing in the search results.

Please note that if the page is getting deindexed, it is completely upto Google if they want to index or not index your website. So, if you haven’t willingly or accidentally made your page noindex and Google still isn’t indexing your page – it means that Google doesn’t want to index that page.
Please check this website for more details.
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.