At least one of the urls has to be indexed. You need to narrow down your problem, and that's why I suggested to use another tool to check if they're indexed. If that doesn't find any as well then you need to change your proxy source and see if that helps.
Read my last reply again. To further clarify, there has to be at least one out of the 1xxx urls you tested that has already been indexed due to natural indexing. That's why you need to figure out why SER isn't checking indexing correctly.
Whether the domain is indexed or not is irrelevant to you now as you already built a backlink on the domain. You want to figure out if your backlink has been indexed.
Edit: I suggested you to use scrapebox or gscraper to check indexing as I've heard several times in the past that the index checking in SER wasn't working correctly. Do you have access to either scrapebox or gscraper?
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