Cannot find several token commands "nitrokey_mass_enroll"/"yubikey_mass_enroll"/...

[herrfeder]

After installing privacyideaadm with pip I'm not able to trigger any mass_enroll and some other token commands. I'm always getting

$ ~/.local/bin/privacyidea -U http://127.0.0.1:5000 --admin admin --nosslcheck token nitrokey_mass_enroll 
Please enter your password: 
Usage: privacyidea token [OPTIONS] COMMAND [ARGS]...
Try 'privacyidea token -h' for help.

Error: No such command 'nitrokey_mass_enroll'.

But for instance token init is working:

$ ~/.local/bin/privacyidea -U http://127.0.0.1:5000 --admin admin --nosslcheck token init --otpkey 1234
Please enter your password: 
result: 200
{'status': True, 'value': True}
serial: OATH000247C5

I can confirm, that in /usr/local/lib/python3.6 are the correct files.
I tried to resolve the issue myself, but I really don't understand the problem as I doesn't see any difference in the initialisation in commands/token.py between init and nitrokey_mass_enroll for instance. Moreover using interactive shell I can trigger the command via dict:

In [1]: from privacyideautils.commands.token import token

In [2]: token.get_command('', 'nitrokey-mass-enroll')()
Usage: ipython3 [OPTIONS]
Try 'ipython3 --help' for help.

Error: Invalid value for '--digits': invalid choice: 6. (choose from 6, 8)
An exception has occurred, use %tb to see the full traceback.

SystemExit: 2