Problem
A project password cannot be cleared although the secure devices have been removed from it.
Resolution
It may happen that...
- ... secure device certificates are still present in the project; remove them from the list (see here).
- ... the 'Security' flag has not been set to 'Automatic' or 'Off' to the topology backbone or to Group Addresses.
Verify the above and try again via the 'Clear Password' button. See here.