You invite them as an accountant user.  You get two slots for that.  Gear>manage users>add accountant

Resolution for 'add accountant issue: 'Hi, I need to add more than one accountant’s email on my quickbooks account. How can I go about doing that?' available: Yes.

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

For more information about resolving issues related to add accountant in Quickbooks/QBO or to get support for the issue 'Hi, I need to add more than one accountant’s email on my quickbooks account. How can I go about doing that?', click the link below: