Scan to Computer not working for HP Officejet Pro 7740

[PCPHARM1]

A client purchased a HP Officejet Pro 7740  to replace  an older model Officejet Pro printer. She installed the printer herself and connected it to the LAN via Wifi and followed setup instructions that came with the paper - can print successfully but could not Scan to Computer. She is not tech saavy. She calls me in, the IT Consultant.

I decided to standardize the setup as we do for printers: Static IP, Disable IPV6, did some initial Ping testing (1-6ms delay, no packets loss etc)
I set the IP Addressing mode to Static (IPV4).
I disregarded her setup and decided to install the Driver and Software from scratch. I removed her installed printer from Devices and Printers (not from Add/Remove Programs/Software)
I went to HP's website to obtain what I hoped to be the "Full Feature Software and Drivers" like in the older times.
I instead was directed to "Install HP Smart" which I did.

The printer installed and test prints are fine. Scans initiated from the HP Smart App for Windows 10 Professional x64 work well as expected. The problem is when I try to do the Scan to PC/Computer option from the copier. At first, the computer on the LAN were not listed on the printer. So I thought maybe I have to Enable "Scan to PC" and set it to AutoStart from the Printer Software like in the good old days. My initial look into this method was futile because things are now different, because it's different software. Instead what I did was go into the settings of the Printer from via the HP Smart App to check scan settings. I was presented with a message which said "Scan to Computer disabled, Please check with the Administrator that installed the printer". I went to HPs website to do research and I was directed to run HP Print and Scan Doctor for Windows. I did run it and it stuck on checking "WIA SCAN" after about 25 minutes of scanning without completing. I decided to stop it.
I did recall that up to that point, everything checked out, inclusive of the driver. At this point (which I don't recall clearly) HP's software did allow me to download additional software to install or fix the issue and I decided that this was all too lengthy and complicated for a printer Install. 

I decided to do this over on a separate Windows 10x64 Professional PC with the exact same results as documented above, with Printing working, scanning working only when initiated from the HP Smart App.

From this point:

I removed the printer from Devices and Printers and I tried obtaining the driver entitled  "HP OfficeJet Pro 7740 Wide Format All-in-One series Basic Driver - IT Professional Use only (hey, that's me!!)" in the support section of HP's website for the printer. I was hopeful, 
because then I ran this install, it very much resembles the install of the good old Officejet 8600 pro days! 
Everything checked out! I opened the familiar Printer icon on the desktop, and I Enabled "Scan to Computer" and set it to AutoStart when Windows starts up! I went to the Printer to do a Scan to Computer and the Name of the computer showed up! I tried to scan and almost immediately, a prompt entitled "HP Scan" popped up on the Windows Desktop with the red "X" message (see attached photo) saying "The HP OfficeJet Pro was not found"

At this point, I decided to call it quits and seek out help.
It could be my firewall application. I didn't disable it.
Computer security is important to us,- and what I would prefer is to whitelist the IP Address of the printer and the specific port number/s for scanning to work properly

Can anyone advise on a way forward? Thank you.
I appreciate your knowledge as it will help me to technically understand how HP Printers/Scanners work today.
It seems so complicated but I wish to say very soon that it was due to a lack of my understanding and it really is a piece of cake!

Please see 3 attached screenshots via this Google Drive Link: 

https://drive.google.com/drive/folders/198sqwHyQrzGZKgjDI2Zqk0uBMfiHzdH9?usp=sharinghttps://drive.go...
I am also wondering..do I have to specify my gateway and dns settings on the printer..I did not remember doing that at all! I will recheck in due course and post update here.
Thank you!

[praveenbv]

Hi@PCPHARM1,@, Welcome to the HP Support Community!

The only option left is to perform a full reset and re-initialize the printer. 
     
    The reset instructions are specific for your printer and performing those steps on a different printer may brick the device. 
    I've sent you a private message with reset instructions, follow the reset instruction to perform a full reset and re-initialize the printer. 

1. From the printer control panel, touch or swipe down the tab at the top of the screen to open the Dashboard, and then touch ( Setup ).
2. Touch Printer Maintenance. 3. Touch Restore. 4. Touch Restore Factory Defaults. A message appears stating that the factory defaults will be restored. 5. Touch Continue.

Let me know if this helps.

If the information I've provided was helpful, give us some reinforcement by clicking the "Accept as solution" button, that'll help us and others see that we've got the answers!

Thanks!

Have a great day!