2FA message disappearing too quickly.
Today I have bought the 2022 iPad Pro, but upon activating it, the 2FA message approval message that appears on the iPhone and mac computer disappears as soon as it pops up, leaving no time for me to approve the iPad login. Of course the problem was solved by hitting "Enter" as soon as the message appears on my Mac computer but I still want to know what caused this to happen, because I believe this to be a security concern.
Strangly, there are no apple devices added to iCloud besides mine. So iCloud is not shared with family. I would appreciate if some can explain this phenomena to me because I believe this to be a matter of security.
Thank you.
iPad Pro, iPadOS 16