QB Issue Resolution:

It’s a new bug Intuit introduced about a month ago.  They are reportedly working on it, so it should be fixed within a year or two.

Resolution for Issue 'Why won’t batch transactions under Batch Actions button work?' available: Yes (Solved).
Source: Intuit Community forum.

Why won’t batch transactions under Batch Actions button work?: 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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