Hi Isabelle. I'm Greg, an installation specialist, 10 years awarded Windows MVP, and Volunteer Moderator, here to help you.
If it's a work computer I would contact the company's IT tech desk to ask exactly how they way you to set it up, because as we've shown here it can vary. It's not something you can guess about if you're using this PC for work. You need them to instruct you unless they are willing to let you use your personal Admin account to do your work with.
If they don't require you to sign into a domain or Azure then I'd ask if you can just set up a separate Admin User account to use in Settings > Accounts > Family & Other Users > Other Users, or even use your own account.
But if they want a company account then you can also to go into Settings > Accounts > Access Work & School to add their email account eveb if they don't have a domain or Azure.
Let me know what they say.