Where to mail an IRS CP11 notice response?

Question

I received a CP11 notice regarding my Year 2020 tax return and would like to submit a response expressing my disagreement with the assessment. Despite the notice stating I should call to review my account with a representative, I am unable to reach anyone at the IRS (it seems like a cruel joke to suggest calling when it's nearly impossible to reach a real person).
I also can't locate an address to mail my response. I'm afraid the address on the payment stub is only for payments, and I don't want my response to get lost in the shuffle.
Where should one mail a letter for this type of correspondence?

Orange Coast- reinstate Monica · Answer

From IRS.gov,

What should I do if I disagree with the changes you made?

If you disagree, contact us at the toll-free number show at the top
right corner of your notice, or respond by mail to the address on your
notice. If you write to us, include a copy of the notice along with
your correspondence or documentation. (emphasis added)
We’ll reverse most changes we made if we increased the amount you owe
or if your return requested a refund. However, you must contact us
within 60 days from the date of your notice to request the reversal. ...

https://www.irs.gov/individuals/understanding-your-cp11-notice

Where to mail an IRS CP11 notice response?

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