It sounds like you may have Klaviyo's double-opt in setting enabled. If you're on Klaivyo's free plan there is no way to disable this setting, but if you're on a paid plan then you should be able to edit this setting within the list itself. Here's a help article from Klaviyo with more details: https://help.klaviyo.com/hc/en-us/articles/115005251108-The-Double-Opt-In-Process
Hopefully this helps!
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