This is a great location to get assistance! I read your post and see that your HP Officejet 8600 printer is asking for user name and password while scanning to email. I would like to help you resolve this issue.
Unplugging the router for 30 seconds, once it is back up turn the printer off and on again and check for any difference.
If the same persists try setting an alternative DNS address and check if that may help resolving any connectivity issue.
Enter the EWS page and go to Network.
Next go to IPv4 under the active connection type.
Under DNS Address Configuration select Manual.
Set the preferred address as 126.96.36.199 and the alternate as 188.8.131.52
Apply the changes and check for any difference.
To access the EWS click the network icon on the printer screen to locate its IP address.. enter the IP address into your web browser.
Let me know how it goes.
Sandytechy20 I am an HP Employee
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