QB Issue Resolution:

gear>chart of accounts>select the account edit and check Disconnect this account on save, and save.
Be aware that the account will no longer show on the home screen AND will no longer work for downloads

Resolution for Issue 'Is there a way to ‘uninstall’ link to bank account? There is an error and I need to do this step with my accountant.' available: Yes (Solved).
Source: Intuit Community forum.

Is there a way to ‘uninstall’ link to bank account? There is an error and I need to do this step with my accountant.: 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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