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 'button work issue: 'Why won’t batch transactions under Batch Actions button work?' available: Yes.

The button work 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 button work issue yourself by looking for a resolution described in the article. If it is a complex button work issue or you are unable to solve the issue, you may contact us by clicking here or by using other button work support options.

For more information about resolving issues related to button work in Quickbooks/QBO or to get support for the issue 'Why won’t batch transactions under Batch Actions button work?', click the link below: