Rumors say that you can read out the "secret" from the phone though.
This may be a security issue (don't lose your phone).
Some password safe apps may also be able to generate the tokens once
you set them up with the necessary definitions. I know that
KeePassXC can do this.
There are also some Linux programs that can generate the tokens. I
experimented a little with one of them (don't remember which one)
and for me the problem was that I needed to enter the secret on the
commandline. However, there are also open source libraries so you
can write your own TOTP generation programs pretty easily (never did
that though). The standard is not too complicated to do it even from
scratch if you like. ;-)
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