They might just need time to get used to it. I had that happen too but they eventually started using it. Make sure it's not in the direct sun so it doesn't start to ferment too soon. I make a big batch but put most of it in the fridge, only putting out about one cup at a time so it doesn't go bad, and I can change it out every few days.

From: Neighbors_nobhill-nm <neighbors_nobhill-nm-bounces@mailman.swcp.com> on behalf of JRB via Neighbors_nobhill-nm <neighbors_nobhill-nm@mailman.swcp.com>
Sent: Sunday, April 26, 2020 5:46 PM
To: Nob Hill Neighbors <neighbors_nobhill-nm@mailman.swcp.com>
Subject: [Neighbors] Hummers are here

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Hello: Hope you are all well and safe. I have noticed that our hummers are here. I have cleaned the feeders and put them out with fresh nectar. The little buggers take a quick look and then ignore the feeders. I am wondering what I am doing wrong? I use a ratio of four cups of drinking water (from the store) and one cup of sugar, boiled and mixed. Once cooled, the mixture goes into the feeder. Not very interesting to our hummers for some reason and I am wondering why. Comments from you hummer lovers appreciated. Stay safe.