QB Issue Resolution:

The usage limit only applies to US accounts. However, if they use the Advanced version, which is only offered in the USA, they can create as many locations, classes or accounts as the want.┬áIn QuickBooks Online Australia, there’s no limit.

Resolution for Issue 'Limits to Classes and Accounts' available: Yes (Solved).
Source: Intuit Community forum.

Limits to Classes and Accounts: 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.

Support for Online Australia
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