QB Issue Resolution:

there is no undo in QBO

gear>settings> chart of accounts

check mark show deleted accounts, and if it is there edit it and see if you can remove set it to active/undeleted

otherwise create a new account

Resolution for Issue 'how do i undo a deleted chart of accounts?' available: Yes (Solved).
Source: Intuit Community forum.

how do i undo a deleted chart of 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.

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