For bootloader unlocking or specialized SDK access, you must register your device IMEI on the official HMD developer sub-domain. Your "username" is typically the email address used during registration.
For bulk deploying devices in a corporate setting. hmd+device+kit+username+and+password+link
HMD Device Kit: A Guide to Username, Password, and Access Links For bootloader unlocking or specialized SDK access, you
This guide simplifies the technical hurdles of accessing the HMD toolkit for developers and enterprise admins. What is the HMD Device Kit? hmd+device+kit+username+and+password+link
The HMD Device Kit is a specialized environment designed for developers, testers, and enterprise partners. It typically provides access to: To install or recover device firmware.