Cannot print #10 envelopes

[BJCspartans]

Whenever I try to print envelopes, printer displays message saying paper in tray does not match paper selected. Paper selection is for #10 envleopes, which is what is in the printer tray

[Echo_Lake]

@BJCspartans
Thank you for posting on the HP Support Community.

Don't worry as I'll be glad to help, however, to provide an accurate resolution, I need a few more details:

• Does it while printing regular paper?
• Cold you please share the picture of the print settings?

While you respond to that, let's try this workaround: (Dragon-Fur)
Change the paper in the tray, you need to tell the printer about the new paper type/size.

User Guide

Page 22-23 

Check / Adjust / Retain the Paper at the Printer Panel

• Open Printer Tray,
• If you have not yet done so, add the desired paper type
• Close Tray
• IF applicable for your printer:
• On the printer control panel, Click Modify (wording varies), set the paper size and type, Click OK

NOTE: If the size of the Paper Size is not in the Drop-down list, Select Custom

Set the Preferences - Windows

 Make sure you have selected the Media (kind of paper), source (tray), and paper size in your printer settings.

Control Panel > icon view > Devices and Printers > Right-Click on your printer > Printing Preferences >

Tab Printing Shortcuts > Click / Highlight preferred shortcut > Click Apply > Click OK to exit

If the printer software supports the feature, change the settings as desired, then use “Save as” to create a Custom Shortcut.

OR

Windows key + S (search for) Printers and Scanners

Left-Click on (your) Printer > Manage >

Printing Preferences

Select a shortcut and / or set “preferred settings” for paper, source (tray), other settings

Optional (if / as available): Save As > enter a name for your custom shortcut

Click OK to save the preferences

Next, create and print the envelope.

Example

Rabbits_and_Chickens_Test_Envelope_10_1

Reference and Resources – Places to find (more) help and learn about your Printer

Clarification of terms or "what the printer can do" (Specifications)

Additional "How-to" procedures

Search for additional solutions...

Printer Homepage – “Things that are your printer”

• NOTE: Content depends on device type

HP Drivers / Software / Firmware Updates, How-to Videos, Bulletins/Notices, Lots of How-to Documents, Troubleshooting, Access to the Print and Scan Doctor (Windows), User Guides, Product Information, more HP ENVY Photo 7855 All-in-One Printer

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.