QB Issue Resolution:

Yes, you have to add the acct.  I had to call support because I never saw a file without this default acct. till recently.  +other current asset>undeposited funds.

Resolution for Issue 'My client does not have an Undeposited Funds account in her QuickBooks Online. Do I have to turn on this feature in the program?' available: Yes (Solved).
Source: Intuit Community forum.

My client does not have an Undeposited Funds account in her QuickBooks Online. Do I have to turn on this feature in the program?: 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.

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