If it is a business Apple ID ask your employer.
Normally this is name@company.xxx
Also ask for an iPhone from your employer.
With a corporate Apple ID, you have many limitations.
Don't merge your private Apple ID account and your business Apple ID.
Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.
See -> Sign in with your Apple ID -> Sign in with your Apple ID - Apple Support
If you still need help, get more help and assistant from Apple directly, see Contact Apple for support and service -> Contact Apple for support and service – Apple Support (UK)