I own a handy asus x00p with android 8 that fits my hand (released in 2018). I have a newer android 11 device (released in 2020) but it’s larger and heavier and I don’t really like using it.
What are the security risks, if I go ahead using the 2018 model to 2fauthenticate?
2fa codes are usually time based. As long as the system time on the device is correct it should be able to generate a matching code
OP never said how they got the codes. Could be SMS.