You can’t reset your own password because you haven’t registered for password reset.

Situation: When a user attempt to change his password, he gets this message:

You can’t reset your own password because you haven’t registered for password reset.

Or SSPR_0014: You haven’t registered the necessary security information to perform password reset. If you’re an administrator, you can get more information from the Register for self-service password reset and How to successfully roll out password reset articles. If you aren’t an administrator, you can provide this information when you contact your administrator

Resolution: 1. If you can’t sign in, you may contact your administrator to reset your password for you.

Resolution 2: The administrator may consider to setup self-service password reset (SSPR). These are the steps:

1. In the Microsoft 365 admin center, in the left navigation pane, select Settings> Org settings, and then Security & privacy.
2. Select Self-service password reset, and then choose Go to the Azure portal to turn on self-service password reset.
3. In the left navigation pane, select Users, and then Users – all users
4. Select Password reset.
5. Select All to enable self-service password to reset for all your users, or choose Selected to specify Groups you want, and then select Save.
6. On the Password reset | Propertiespage, select Authentication methods and select the Number of methods required to reset and desired Methods available to users, and then select Save.

When your users sign in, they will be prompted to enter additional contact information that will help them reset their password in the future. Please refer to this post:

How to use Office 365 self-service reset password? – Net/PC How to (howtonetworking.com)