Hi there! My name is***** am a computer professional with over 15 years of experience with both Mac and Windows computers, phones, tablets, and printers. I'm sorry that you are having this trouble. I will do my best to help. Have you tried changing the orientation? For example, if it is landscape, try portrait, and if it is portrait, please try landscape. Let me know the results please.
That is helpful information. According to the user manual for this print, that is the best way to print envelopes and thick paper, etc. because there is a direct path through the printer with less chance of a jam. Her's link to the user manual:
Please click this link and navigate to page 13 to review the illustarted instructions. It could be that you need to orient the envelopes differently. Are you inserting them long size first or narrow side first?
I understand, but since the way that you have always done it isn't working for you, I am trying to help you find a way that will work. When you click print, you should see a popup box that may give some advanced options such as choosing the paper source. If you would like to print landscape without using the rear feed, please look for an option to change the paper source. Let me know if you see any option for that.
My apologies. The envelope should exit through the rear tray. it must be placed in the mp tray. We will need to check the page setup in Office 2103. Please give me just a moment to type out instructions.
Click File > New > Blank document.
Click Mailings > Envelopes.
In the Delivery address box, type the address.
In the Return address box, type your return address.
Word gets information from your printer about how to load the envelope. Under Feed, you should see a picture indicating how the envelope should be oriented.
When Word prompts you to save the return address, click Yes.
Change the size, font, or layout
On the Envelopes tab in the Envelopes and Labels box, click Options > Envelope Options.
To change the envelope size, click the arrow next to the Envelope size list and select the choice that matches the size of your envelopes.
To change the font, under Delivery address or Return address, click Font and choose the font you want to use.
To change the position of the addresses, click the up or down arrow next to From left or From top. The Preview area shows you the new layout.
Save your envelope settings and use them again
To save all of the settings you just created for future use: in that same box (Mailings > Envelopes), click Add to Document. You’ll see the envelope added to your document as page 1. Click File > Save As, choose a location, give the envelope a name, and click Save.
I hardly think that you took the time to read through all of that so quickly, and I also think it very unlikely that you have looked at the manual that I provided. It doesn't seem that I will be able to help you, so I will opt out and open the question to other experts. Have a pleasant evening.