Rename Junk folder

As Diana.McCall has suggested, you will need to sign into your Microsoft Account using a web browser. Try entering: https://outlook.live.com/owa/

This should take you to a login page for your Microsoft Account. Enter your Microsoft user credentials (username & password). A web page should open with your Outlook Mail account.

In the left-side window you should see all of your email account's mail folders. A number of these folders are "permanent." That is, you will NOT be able to rename them. These include the Inbox, Junk Email, Drafts, Sent Items, Deleted Items, & Archive folders.

When you access your Microsoft email, these are the folders that would appear on your iPad.

What you need to look for are other folders that may exist when you are accessing your mail using a web browser. This is where you may have more than one "Junk" folder.

Hi. Try logging in to webmail on the server. You should be able to manage the folders there.

Your provider must offer web access to your email. In Safari, enter the provider's address, outlook.com maybe? Login, find Mail, and interact with what you find there. I don't use Microsoft, so cannot tell you any more.