A license issue would never prevent you from logging in... that isn't the case here.
What error message are you getting?
If you are positive you have the right password and cannot login, I would suggest trying a different browser, like FireFox, to login and if that doesn't work a hard reboot of the system can sometimes correct this problem.
I am assuming you don't use the "system" login? If not, it might be worth it to reach out to your vendor to see if they can access the system at the system level and reset you login credentials for you local admin user. If that fails, they will need to open a ticket with Mitel support to have the password reset which will also require an active Mitel SWA (Software Assurance) agreement before they can even open a ticket with support. Both software assurance and a password reset are items that have a cost, your vendor can guide you through that but I can tell you that it isn't "cheap".