About Indexing

This process can be challenging when dealing with third-party sites. It takes time and effort to ensure that Google recognizes these backlinks and attributes them correctly to your site. According to my knowledge, you can try these indexing tools

Omega Indexer
Indexmenow
Elite Link Indexer
GIndex
Indexification
Instant Link Indexer
Link Processor
 
take a look here :
https://www.blackhatworld.com/seo/i-cant-index-on-google-third-party-site-please-help-me.1496989/
 
In my opinion, usually Google bots take a certain time for crawling and indexing any URLs. When it comes to third-party URLs, the time period may be longer than usual one. Because it's required to analyze the URL's attributes and then store the information in the respective categories on the web server.

However, you can think about the manual request submission of Google indexing, which may be work out.
 
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