QB Issue Resolution:

This can cause duplicate transactions since both platforms are sharing each other’s information. To avoid this from happening, you can connect one account only. This would be enough since each of the account already has all the transactions.

 

Lastly, you can connect multiple accounts in QuickBooks but, you’ll need to do it separately.

For more insights about connecting bank accounts to QuickBooks, please check out this article: https://community.e2e.lc.a.intuit.com/articles/1363459

Resolution for Issue 'I have connected my NAB bank account and my PayPal account into Quickbooks.' available: Yes (Solved).
Source: Intuit Community forum.

I have connected my NAB bank account and my PayPal account into Quickbooks.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for NAB bank account
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