multi factor – What are the risks when you use QR to authenticate when you use MFA offline in cases where the network is unavailable due to a network failure

if the PingID service is inaccessible, the user will receive a QR code on an offline authentication screen. in the case of an offline MFA when the network is unavailable due to a network failure (for example in an airplane or when network reception is poor) or a similar problem, I wondered what the possible risks were exposed here.