Maintenance for the week of July 6:
• PC/Mac: No maintenance – July 6
• ESO Store and Account System for maintenance – July 8, 10:00AM EDT (14:00 UTC) - 12:00PM EDT (16:00 UTC)
Maybe you have it disabled in "filters" option ? When you open map there should be a "filters" menu on the right side. Check if any tick-box is disabled.
An add-on may be causing issues with your map symbols. We have two help articles linked below that go over how to uninstall or remove add-ons that you're currently using.