Javascript web sdk,message kakao link not available on mobile ios devices

When I run the javascript web sdk on the mobile ios device and safari browser, message kakao link cannot be opened, and the following error message appears:
Safari cannot open the page because the address is invalid.
The api I use is Kakao.Link.sendDefault

hi~
The above message occurs when a custom URL scheme that is not registered in Safari is called.
In other words, it occurs when the Kakao Talk app is not installed, and after the message is printed, it moves to the market.
Please check if the Kakao Talk app is not installed on the tested device.

Hello, thank you very much;
Excuse me, after downloading the kakao talk app, do I need to ensure that the app is logged in before logging in on the web side safari?

There is no need to check.
If you are not logged in to the Kakao Talk app, the login screen will be displayed when you run Kakao Talk.

thank you very much tim brother,i known;

hi,tim.
I found that when the firefox browser performs kakao talk link on an ios device, the following pop-up window will appear;
1d9ed208f9c549395cb04e73f3e779ee

When on an Android device, when the firefox browser shares kakao talk, nothing happens;

and ios and android opera browser;
Can’t pull up the kakao talk app to link.
ios opera browser version is 3.2.12;
android opera browser version is 68.2.3557.64219;
238746bf76011edabf87ce8ba01f258d
c6d9e887-e5ad-4d42-af02-586b252d0f10