Basically my friend sent me a link to a map he created on experience builder it worked when I first tried it last week but now it is saying you do not have permissions to access this application, how would I resolve this
Did you ask him if he revoked permissions?
It should be a one the public is able to view on experience builder you try and view it
https://experience.arcgis.com/experience/e7f69a403a94499aa40dc1e4b9c507d2
?
Nope. Call your friend.