Unfamiliar number on my first Apple ID

Let’s rephrase what I think you’re saying.

• Your MacBook was purchased in 2021.
• It was set up using an Apple Account (formerly called Apple ID). Let’s call this Account 1.
• In 2022, you purchased a new iPhone.
• You created a new Apple Account to use on the iPhone. Let’s call this Account 2.
• You continued to use the MacBook, having never thoroughly cleansed it as it should have been (since the two Apple Accounts are like two different people): What to do before you sell, give away, trade in, or recycle your Mac - Apple Support
• You intermixed the two Apple Accounts on your Mac. Account 2 has no access to Account 1’s apps or data, so problems began.
• Account 1 became compromised as a device using it was stolen.
• But Account 1 still owns the Mac, and its credentials are required to release its Activation Lock.
• Therefore, your only hope, as documented here under “Start a support request”, is if you have proof of purchase documentation for your Mac.

How to remove Activation Lock - Apple Support

tawananyasha160 wrote:

does it mean that the credentials on my second Apple ID are useless for unlocking my MacBook?

Yes. Your two Apple Accounts are treated as two different people. Account 1 owns your MacBook; Account 2 does not. Account 1 must perform the steps required in the first article I linked above before the Mac is “given away” to Account 2.