A case occurred where a PC was registered without permission in Apple's mobile device management, and many similar experiences were received in comments.

Jay posted a question on the question site 'Stack Exchange' about how he reinstalled the OS to sell his old MacBook second-hand, but for some reason it ended up under the management of the Expedia group due to mobile device management (MDM). As a result, many people came forward who had similar experiences.

macos - Why is my Mac trying to force me to enroll with Expedia Group upon installation? - Ask Different

https://apple.stackexchange.com/questions/467625/why-is-my-mac-trying-to-force-me-to-enroll-with-expedia-group-upon-installation

Why is my Mac trying to force me to enroll with Expedia Group upon installation? | Hacker News
https://news.ycombinator.com/item?id=38722915

Jay's MacBook was purchased directly from Apple in 2015 and he has kept it for a long time. When I purchased a new model and reinstalled the OS to sell my old MacBook second-hand, I encountered a problem where a pop-up dialog asking me to register with the Expedia group was displayed for some reason.

When jay posted on Stack Exchange, the answer was ``The cause was that the serial number was registered incorrectly during automatic device registration .'' Apple products have a function called mobile device management (MDM) that manages devices collectively on an organizational basis when used for business, and ``auto registration'' is a function that automates registration in MDM. It looks like you can get it resolved by contacting Apple support.

When this topic was posted on the news site Hacker News , we received many cases of problems related to MDM.

runjake posted on Hacker News about what happened when a MacBook Pro logic board used at work was installed as a recycled product in a Puerto Rican MacBook Pro. Since the serial number of this refurbished logic board was not changed, it was decided to be incorporated into runjake's company's MDM.

annoyingcyclist said that the iPad he sent for repair was returned, so when he started it up, he was asked to register for MDM at a school in Florida . Annoyingcyclist told Apple, ``I bought it from Apple,'' ``I have no intention of registering for MDM with my personal Apple ID,'' and ``I've never heard of the school, and I don't know anyone in the IT department who can unregister the device.'' He says that he was able to get rid of MDM by telling them.

jmbwell analyzed the reason why MDM problems occur only with Apple products: ``Apple products' MDM is superior in terms of functionality and has been introduced by many companies.'' Unlike the implementation process, device decommissioning procedures can be ambiguous depending on the organization, and it is unavoidable that devices registered in MDM end up on the second-hand market.