Sorry for taking so long to finally get back to this, but elsewhere someone suggested that I download, install, & set up Twilio Authy and configure it for PayPal, and so far that seems to be the best solution for me. And someone else suggested that failing to complete setting up the 2-step verification process or ignoring one of its crucial steps actually turns it off, so I guess that's another possible option for me. Anyway, thanks for your suggestion, as it's appreciated anyway.
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