If you did not link the pre-installed apps to your Apple ID when you set up a Mac purchased new (new-in-box from any seller) or purchased refurbished directly from Apple after October 1, 2013, see this support article about how to "accept" bundled applications on a new Mac. If you did link them, sign into the Mac App Store with that same Apple ID & check under the Purchases tab in the Mac App Store.
Apple has chosen to "hide" your account page in Mojave. Click your name in the lower left of the Mac App Store window to get to your account page. You may need to click on purchases to see the apps to accept. If you still don’t see the option to “accept” the apps deleting them & re-downloading them from the Mac App Store may work.