AdMob Banner is not working

I have created an AdMob account and have made a banner called Banner_1. I then made an AdMob object in GDevelop and named it Banner_1. I put in the IOS ID in the properties and made it appear at the bottom of the screen. I also made it so when the scene begins the banner will show. Whenever I test the scene it loads up from 1% but freezes at 100%, and the scene never loads. If I go from a different scene to the scene with the banner in it the scene will freeze. If I create a new banner without editing anything, the same will still happen. How can i fix this? Thanks.

Can anyone help? thanks