New to the community? Welcome! Please read our Community Rules and Guidelines
Its risk and its done by their security system algorithms. Was it a large amount? Maybe should have waited a few days before doing a transaction. New accounts are super security sensitive.
By the way, I suggest opening a case with bbb.org under PayPal San Jose CA to get PayPal Office of Executive Escalations to review your account. It likely some false positive or misunderstanding.