How to report mega backdoor IRA contributions?

My company offers a 401K account with Fidelity. I already maxed out my normal 401K contribution for 2024. I'm not eligible for Roth IRA. I did not contribute to traditional IRA. However, Fidelity supports a mega backdoor Roth IRA so I contributed an additional $14K after-tax fund into my 401K account and than did an in-plan Roth conversion.

 

For more information:

https://www.fidelity.com/learning-center/personal-finance/mega-backdoor-roth

 

Can I also contribute to traditional IRA for 2024 before April 15 even after I contributed to the mega backdoor Roth?

 

Do I need to report the $14K mega backdoor Roth contribution in this scenario? If so, please share the steps.

 

Thanks for the help.