Unfortunately due to Open Banking regulations we can't share bank account feeds across multiple TaxTank accounts. When your co-owner sets up the shared property, they manage the bank feeds and transactions for the property so there is no double up.

If it's a shared bank account and you need to allocate other transactions in your TaxTank account, then you can add the bank feed to your account and allocate the transactions related to your co-owner and shared property as personal transactions. The below article goes into details on how to do this.