I’ve gone through the same mess with Dell and a few other companies. I try to avoid buying from those companies as a result.
FWIW, my last two PC purchases were from a Costco warehouse, literally because Dell’s “security” system didn’t like the fact that my real name doesn’t appear in my e-mail address (what the support person claimed after being pressed for an explanation). The fact that I’ve had a Dell account with that e-mail address for decades, and made plenty of purchases in the past didn’t matter at all. “The algorithm” decided that I was no longer cool enough to do business with them.
These companies contract for massive anti-fraud systems that they don’t understand, so when it generates a false positive (rejecting someone legitimate), nobody knows why, and even if they know, they may not be allowed to tell you.
Or they start demanding more proof-of-ID information than I gave the bank to get my mortgage, which I refuse to give them, because I don’t want identity thieves to get a hold of it when they inevitably will get hacked in the future. (It was this nonsense that caused me to close my PayPal and eBay accounts a long time ago.)
I’m sure the accountants take a look at the lower fraud numbers and claim victory, but ignore the fact that it is almost certainly taking a bite out of their legitimate sales as well.
And as a customer, if this means I have to go back to shopping at brick-and-mortar stores, as I did for those two PC purchases, well, I’m OK with that.