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HP OfficeJet Pro 6978 All-in-One Printer

Setting up the HP Office Jet Pro 6978 for multiple PC's in the office, which 2 out of 3 had no issues installing and signing in through the HP Smart desktop application to perform scans.  The final PC when attempting to sign in through HP Smart goes to a pop-up window that says "Connection to Service" that is greyed out with no movement, which I left for 30 minutes & no success.
All 3 PC's are configured exactly the same on the same Windows 10 OS and on the same network sharing the same firewall rules.
I followed HP's recommendations on uninstalling the HP Smart application & deleting all program files from the PC then reinstalled but still the same result.
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