A family of Microsoft word processing software products for creating web, email, and print documents.
Hi, I'm Mite, and I'm here to help.
Your document is being sent to Microsoft Word because Word is the application that handles the .doc or similar file type, and Microsoft 365 is the subscription service that includes it. Microsoft 365 is not a single application but a collection of apps (like Word, Excel, and PowerPoint), plus online services and cloud storage.
In this case, when you print a .doc file in Microsoft 365, it will choose a suitable app, which is Word, to handle the file. It's different from the desktop version, which will generate a PDF file and send it to the browser to print it.