Code P0457, “Check fuel fill inlet” message turned on?

A couple months ago I got a notification to “check fuel fill inlet” as it is a capless tank. I did some research and purchased some carb cleaner and cleaned the fuel fill inlet as best I could. This cleared the notification for about 2 weeks. At random without reason, it reappeared, And I left it alone for about a month. Last night on my way home from work my check engine light came on (no it’s not flashing) and my car started driving differently. It was consuming a lot of gas and almost seemed like it was struggling to accelerate or go uphill. It was louder than normal during acceleration as well. Today on my way to work it was still driving irregularly, I was gentle with it even though it hadn’t done anything severely alarming yet. I stopped at O'Reilly's and had the Veri scan device connected to read the code. It gave me a P0457 -EVAP system leak detected (fuel cap loose / off) -, and told me that my emissions status was Red due to the issue. My confusion within that is that there ISN’T a fuel cap, it’s an EZ fill inlet. So, on my break from work I used the carb cleaner again just as I did before but this time it didn’t clear the notification from my warnings. Please help. I love my car, and I just want it to work like it was before this dumb problem.