Sorry, you cannot make an appointment with the same Tax Expert who helped you file your return.
See this TurboTax support FAQ for contacting a Tax Expert when using one of the TurboTax Live editions - https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-setup/connect-tax-expert-turbotax-live/L73wOZD5D_US_en_US?uid=l86a1aps
When you speak to a tax expert on a specific issue or question, they take notes during your call in case you have follow-up questions. While you can't make an appointment with a specific person, the next tax expert you speak to will have reviewed any previous notes and can pick it up from there.
I GOT A LETTER FROM THE IRS
https://ttlc.intuit.com/questions/3605673-i-got-a-letter-or-notice-from-the-irs
If you purchased Audit Defense for your tax return, call Tax Resources, Inc. at (877)-829-9695, or report your notice on their web site at http://intuit.taxaudit.com/. Do not contact the IRS. Let Tax Resources contact them for you.
This is the membership email you should have gotten: https://ttlc.intuit.com/questions/1901569-when-will-i-get-my-audit-defense-membership-kit
Also read the member agreement at this website -https://turbotax.intuit.com/corp/auditdefense.jsp
If you did not purchase Audit Defense:
TurboTax has a special phone number for help with IRS tax letters, which will be easier than going through regular Customer Support. At the page below, click on the blue button that says "Get Help from TurboTax Support". Then it will ask you what tax year is your letter. Then it will ask you what the letter concerns. Then it will show you the phone number during posted business hours.
https://support.turbotax.intuit.com/irs-notice/audit-support/