They do it every 20 min. For the day you're trying. I found it easier later in the day, but that was me. Good luck!
I do see the times open up, when I go to select the time I input my information and then it will tell me no scheduled times are available.
It's mos def way harder than it used to be but at least they're back to registering folks
sometimes if you just keep checking throughout the day an opening will show, good luck
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