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Yes. You only need it for the dependent. 

If a dependent mistakenly indicated no one can claim them and causes a rejection of the parent's return, the IRS now allows the first-listed (primary) taxpayer (such as the parent) to get an IP PIN and still successfully efile and avoid having to file a return on paper.   Your dependent will need to amend their return to indicate someone else is claiming them. See this TurboTax FAQ for help with amending.

The IP Pin will change each and every year. This is an Identity Protection Pin.  

You can get an Identity Protection pin here, or if you lost your IP PIN, you can go here to Retrieve IP PIN. 

Here are two ways to navigate to the section to enter the 6 digit IP PIN: 

1. Log in and open your return ("Take me to my return")
2. Once the return is open, then go to the Federal Taxes tab.
3. Subtab Other Tax Situations
4. Scroll down to Other Return Info.
5. Choose Identity Protection PIN and Start (or Revisit.)
6. Next screen asks:  "Did you or any of your dependents get an IP PIN from the IRS for this year's taxes?"

Or another way: 

1. Open your return if not already open.  ("Take me to my return.")
2. Once the return is open, click at the top on MY ACCOUNT, then choose TOOLS.
3. In the Tools window choose TOPIC SEARCH.
4. Enter IP PIN without quotes.
5. In the selection list highlight IP PIN and click GO.
6. Next screen asks:  "Did you or any of your dependents get an IP PIN from the IRS for this year's taxes?"

There is a new procedure the IRS started last year for TY2024. It allows returns that claim dependents who have already been claimed on another taxpayer’s return to be efiled.

Since your son already claimed himself, your return is getting rejected. You can get an Identity Protection Personal Identification Number (IP PIN) for him, enter this on your return and re-file electronically.

Here are some good references:

IR-2024-294

Age, name or SSN rejects, errors, correction procedures

Protect Yourself From Tax-Related Identity Theft: Get an Identity Protection PIN