QB Issue Resolution:

Yes, most Financial Institution allows multiple connections. American Express Business Card uses Connect to QuickBooks and only supports Online Banking to one company file.

Syncing a bank account to multiple QBO account might cause some connectivity issues. Make sure to check with your FI before performing the process.

Take a look at this article for more information: Connect your American Express Business Card to QuickBooks.

Here’s how to connect your account:

  1. Go to Banking and choose the Banking tab.
  2. Click Connect or select Add Account if you already created an account.
  3. Type in your bank’s name.
  4. Choose Continue and enter your bank’s login credentials.
  5. Select the type of account.
  6. Indicate from what date you want to download transactions.
  7. Hit Connect.

For screenshots and video tutorial, refer to this article: Connect and add bank and credit card accounts to QuickBooks Online.

That should get you connected in no time.

Resolution for Issue 'Can I sync the same bank account in 2 different QBO accounts?' available: Yes (Solved).
Source: Intuit Community forum.

Can I sync the same bank account in 2 different QBO accounts?: 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 Banking
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Error Recovery for Banking [Canada]
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