couldn't open map without gmail account

Hi,


I have created a custom map on google maps. I can able to view the map page in safari browser without issue. But once when i click button to show the same custom maps in my google maps App. It says "couldn't open map"


The same issue dosent occur once am logged into google account in google Maps App.


Is it mandatory to login into google maps to view custom maps in IOS. Kindly confirm


Thanks