Hi Stijpe,
Thanks for contacting Apple Support Communities!
We understand that your AirTag no longer shows in Find My on your iPhone but it still shows on your MacBook.
You can reset your AirTag and add it to your Apple ID again as outlined here: Add an AirTag in Find My on iPhone
"Add an AirTag
- Go to the Home Screen on your iPhone.
- Remove the battery tab from the AirTag (if applicable), then hold it near your iPhone.
- Tap Connect on the screen of your iPhone.
- Choose a name from the list or choose Custom Name to type a name and select an emoji, then tap Continue.
- Tap Continue to register the item to your Apple ID, then tap Finish.
You can also register an AirTag in the Find My app. Tap
, then choose Add AirTag.
If the item is registered to someone else’s Apple ID, they need to remove it before you can add it. See Remove an AirTag or other item from Find My on iPhone."
We hope this helps you.
Take care!