Serial number shown is not valid as shown??

Why do you think it is not valid? Compare it to the serial number printed on the bottom of your computer.

jamesfromdunnellon wrote:

How can I find the correct Serial number when the one shown on the computer is not valid?

It is not an uncommon issue— not all serial numbers get registered for some unknown reason.

It does not indicate an issue with your Mac... where are you having a complication because of this?

you can verify:

https://support.apple.com/my-support

jamesfromdunnellon wrote:

I signed up for Apple Care and I wanted to see if I still was covered. Of course they ask for the Serial Number. Apple came back with a notice that the number was invalid.

I wanted to change the password on my Mac and I keep getting a notice that I need Administrator approval. I thought I was the Admministrator.

Sounds like two independent issues—

For your Serial number not being recognized — see if this gets you any closer:

Apple Care  tech support 1-800-275-2273

or

Contact Apple for help with Apple ID account security - Apple Support

https://support.apple.com/en-us/HT204169

The OP appears to not want to say why he thinks it is invalid. I've asked twice and now you've asked for the third time.

jamesfromdunnellon wrote:

I contacted Apple Support and owe solved the problem Thank you Have a happy new year

Good computing jamesfromdunnellon. Same to you Happy New Year !

So why do you think it is invalid?