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.
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Resolution for 'created an account issue: 'Can I sync the same bank account in 2 different QBO accounts?' available: Yes.
The created an account 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 created an account issue yourself by looking for a resolution described in the article. If it is a complex created an account issue or you are unable to solve the issue, you may contact us by clicking here or by using other created an account support options.
For more information about resolving issues related to created an account in Quickbooks/QBO or to get support for the issue 'Can I sync the same bank account in 2 different QBO accounts?', click the link below: