My macbook pro 2017 serial number is invalid

You need to copy & paste the system serial number from the "About This Mac" when clicking on the Apple menu.

It seems the vertical line character is most likely the letter "L" (aka "ell") since that is the only variation which produces a valid result of recognition since the number one and the letter "i" (aka "eye") fails.

If the digital copy of the serial number is indeterminate, then check the physical number etched into the bottom case of the laptop since it should be clearer and it should match the digital number. If they don't match, then your laptop has been worked on by someone who mixed up parts between two different laptops either accidentally or intentionally. Or if it was an official Apple repair involving the replacement of the Logic Board, then the tech made a mistake reconfiguring the system serial number which should have been caught when running the Apple service diagnostics after completing the repair.

Faisal346 wrote:

My macbook pro 2017 serial number is invalid on apple site. I don't whats the issue. I recently bought it and I'm not well aware of how it works if someone could help me. Serial number is C02WP00IHTD7

https://discussions.apple.com/content/attachment/35746e22-23c6-40c6-8804-0a5750f33832

you can enter the serial number here in the search field,

Apple - Support - Technical Specifications it will present a Tech spec sheet

this is what I see for your SN:

if you still have an issue

Call Customer Support (800) MY–APPLE (800–692–7753)

or on line https://getsupport.apple.com/

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

Contact Apple for support and service - Apple Support