Currently, when using Power Automate for Business Central documents approval, the approver indicated in the flow has to be either setup as an Approver or a Substitute on the Approval User Setup page in Business Central.

This is really un-practical, as these fields could be used for genuine approval chain using BC workflows for other approval types.

It also makes no sense since Power Automate doesn't use the approval chain structure of that table.

Realistically, Power Automate approvals uses a version of the Direct Approver approval type, and it would be make more sense, as is the case in Business Central, that the approver simply be required to be listed in the Approval User Setup page, rather than explicitly be listed as an Approver or Substitute.