Kevin Kofler wrote:
> What am I expected to use with my PinePhone? Does
> https://apps.kde.org/keysmith/ work?

To answer my own question: Yes, Keysmith works, both on the desktop 
(and notebook) and on the PinePhone. It is also easily possible to 
synchronize the keyring between different devices using Keysmith just by 
copying ~/.config/org.kde.keysmith/Keysmith.conf to the other device over 
SFTP. Then any of the devices can be used to generate the TOTP. (They will 
generate the exact same one-time passwords, I can see it by running both 
instances in parallel.)

GNOME Secrets (formerly known as Password Safe) also works on the 
PinePhone (which is useful because that app can also store the permanent 
password, and is mobile-friendly unlike KWalletManager, though I presume it 
will also work fine on desktops/notebooks). If I enter the same secret 
there, it also generates the exact same one-time passwords.

        Kevin Kofler