acaciawaterwells.com was already added to a different Office 365 account AcaciaWaterWells.onmicrosoft.com.
Sign in to that account as an admin, and remove domain acaciawaterwells.com. Then come back here and try adding acaciawaterwells.com to this account again.
If you can't sign in to AcaciaWaterWells.onmicrosoft.com as an admin, try resetting your admin password.
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