Why don’t I have a Junk folder on my IPhone 12?

Update-moving mail to Junk prompted a Junk mailbox to appear. The Junk folder remained after moving the mail back out to the Inbox. Thanks for responding to me.

On my iPhone 12, I am using the Mail app. The Junk folder does not appear as a choice under "Edit-Add Mailbox". I do have the option to move mail to Junk. On my iMac the Junk folder is displayed for this email account.