I'm here to share some information when changing your company's mailing address, LavaLandscapeCo.

In QuickBooks, the system won't allow you to enter your company's mailing address the same as your PO Box address.

The Mailing Address on the Account Profile Contact Information field should be your company's physical address.

You can take a look at this article for more information when updating your company's information: Change your business name, contact info, or EIN in QuickBooks Online.

I'm just around if there's anything that I can help. Take care!