Just a FYI... It took the full 3 working days, up to the final minutes for the HCMC embassy to approve the COE. I was getting nervous because I fly in 3 days, and no reply to my email or FB message (applied Wed 3rd, approved Mon 8th at 16:53).
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TLDR : Answer Summary
The approval process for the Certificate of Entry (COE) by the HCMC embassy can take the full 3 working days, exemplified by a recent experience where the approval was granted just before the flight.