Virtual Accounts are provisioned by range at supported banks. When an incoming payment is associated with a virtual account within the provisioned range (for example, accounts numbers between 12500000-12599999), the payment will be deposited into your underlying bank account. If there has not been a Virtual Account created for the receiving account number, it will appear unreconciled in Modern Treasury.
If an incoming payment falls outside of the provisioned range, your bank will likely return the payment to the sender.