actually i tried too with google indexing API. none got indexed. but that's maybe because my website is pretty new so perhaps still in sandbox. the good point (if you don't have 1000s of posts to index) is that if you index it on search console manually (10 to 12 links per day maximum) those links got indexed pretty well.Is the Google Indexing API still works ?
I submitted the same 5–10 URLs many times, but they still aren’t indexed. However, GSC’s URL Inspection tool works fine.