Can't login: Temporary server error

[quantenzitrone]

~ $ env ETESYNC_URL=https://etebase.example.com etesync-dav manage add username
Please enter the EteSync account password:
Logging in
Traceback (most recent call last):
  File "/nix/store/4wbv8082bdc124406bqdjncgcyiarvv7-etesync-dav-0.32.1/bin/.etesync-dav-wrapped", line 85, in <module>
    manage(sys.argv[2:])
  File "/nix/store/4wbv8082bdc124406bqdjncgcyiarvv7-etesync-dav-0.32.1/bin/.etesync-dav-wrapped", line 64, in manage
    print_credentials(args.username, manager.add_etebase(args.username, password))
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/4wbv8082bdc124406bqdjncgcyiarvv7-etesync-dav-0.32.1/lib/python3.11/site-packages/etesync_dav/manage.py", line 164, in add_etebase
    etebase = Etebase.Account.login(client, username, password)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/j2sga3zvilh5a2k8pr1jp7p1hfmjsi3w-python3.11-etebase-0.31.6/lib/python3.11/site-packages/etebase/__init__.py", line 91, in login
    return cls(etebase_python.Account.login(client._inner, username, password))
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
etebase_python.Error: Temporary server error

Am I just reading the documentation wrong?
In any case, "Temporary server error" is a misleading error message.