If you've got the User Guide handy, try following the amprecovery steps from the AMP CLI appendix. If it's not tied to the pw you initialized for ampadmin, then it should be 'recovery' - depends what version you're on.
Here's a quick copy/paste of the section from the doc:
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If you forgot your CLI password, you can generate a recovery key and contact Technical Support to decode the
key and provide recovery password to you.
The recovery user credentials is the username and password that you created during the AirWave
installation and the password for the "ampadmin" user. If you didn't enter a username, AirWave
uses the default recovery user, called "amprecovery".
To reset your password:
1. From a local terminal, or the VM host console, log in using the amprecovery credentials:
<AMP server> login: amprecovery
Password: <ampadmin password>
2. Select 1 to generate the recovery key.
3. Select 2 to upload the recovery key to another server using an SCP file transfer application.
4. At the prompt, enter the destination location for the file (for example, user@host:path. User is the name of
the account on the destination computer, host is the hostname or IP address of the computer on which the
file will be transferred, and path is the path of the destination folder).
5. At the prompt, enter the password on the destination computer.
6. Send the recovery.gpg file to Technical Support for key translation.
7. Select 3 to activate the recovery password, then press y to continue.
8. Enter the password you received from Technical Support. If you enter the password incorrectly, the password
remains unchanged.
9. Log out from the recovery user.
10.Log back in to the CLI as ampadmin using the recovery password:
<AMP server> login: <ampadmin>
Password: recovery password
11.Select 9 to open the Security menu, then select 2 to reset the OS user password.
12.At the prompt, select 2 to change the amprecovery password.
13.Type a new password and press Enter.