Recently bought used MacBook Pro, device claims it is owned by another companyMacBook problem

From what you describe it appears that Mac is remotely managed through MDM: Device Enrollment and MDM - Apple Support. Ask the seller to release it from its MDM profile. Until then it cannot be used.

Williamtubman wrote:

I bought MacBook Pro 16’ 2019

secondhand after upgrading it to macOS Sonoma this massage pop up, this Mac is owned by protenus and at the end of the massage it asking me to enroll, and when I try to enroll it says, A server with the specified hostname could not be found. How can I solve this problem please

The computer was not correctly prepared for sale. It appears you bought a computer belonging to some company or organization. Return the computer for a refund. It is of no value to you.

"MacBook problem: I bought MacBook Pro 16’ 2019: secondhand after upgrading it to macOS Sonoma this massage pop up, this Mac is owned by protenus and at the end of the massage it asking me to enroll, and when I try to enroll it says, A server with the specified hostname could not be found. How can I solve this problem please"

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Purchasing a Secondhand Device:

Seems you were scammed, though a fill assumption on my part. This is the site the seller should have used, prior to selling it to you: What to do Before you Sell, Give Away, Trade In, or Recycle your Mac - Apple Support. The seller should have known better. If purchased off of a Web site (i.e. eBay or Amazon), then contact the site, seeing if the seller can be held accountable, and if you can get your money back.