It's a do-follow apparently. But yeah, one link doesn't do much. But 20 - one links should help a bit, I hope.
View the page source and check if there is anything in the 'header' no follow, no index or robots=no follow, no index. It would help if you specified on what kind of page the link is, product page? review? questions? Last but not least, check if the link shows up in GSC, I remember few weeks ago a link from a website showed up in my GSC before it was indexed.
It happens, can't tell you how many times I've seen a link indexed from a website within a few hours and another link from the same website took like a week or so. If those links were indexed before, it's a matter of time before this one gets indexed as well. As long as the page doesn't have noindex or nofollow tags he'll be fine.I'm the one that made the links for EsCeOh, Its a product page, and there aren't any noindex or nofollow tags, I already submitted this in my indexer right after completion and have resubmitted it but surprisingly no links have indexed. I'm perplexed myself.
I paid $10 USD for an Amazon link. It's nice but didn't get indexed a month later. I even passed it through an indexer that has been working very well for me, still, nothing.