018-762 is an SMB timeout, a few things can cause that, so I will cover a few fixes and you can do them all.
1. Switch from Hostname to IPv4 address of the Mac to test if it is a DNS issue
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2. Update the printer firmware
3. Set the correct time on the printer. (Needs to be within 3 minutes of local time)
EWS > System > Date & Time
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This test worked on both with both MFP's on the latest firmware with these exact settings here.
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