Log in to your PayPal account from your mobile's browser. Under the three dots on the left side of the page, you'll find it. Three dots -> Settings->Your profile-> log in and security -> 2 step verification. But someone from the customer service told me that PayPal doesn't offer 2FA for the business account holders and they will disable 2FA in the future even if you have enabled 2FA somehow. If they do, I'll have to delete my account because I've submitted all the bank and personal details that even any government authority would ever ask for.
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