Problem in moving Clash Royale account from android to iOS

I have installed the latest version of Clash Royale on both my devices (the old device and the new one which is iOS device).

Also both my devices are connected to a stable WiFi and my android is connected to Google Play & Google Play Games. My iOS device is connected to Game Center too.

I want to move my Clash Royale from my old Android device to my new iPhone I tried to follow the steps mentioned in the link below:

https://www.quora.com/How-do-I-connect-my-Clash-Royale-on-Android-to-my-Clash-Royale-on-Ipad

But unfortunately both of my devices do not show the Link device button.

My Settings section looks like below:

But the link says that it should look like this:

How can I fix this issue?

I think that the link you are following is a bit outdated, and I'm not sure that Supercell supports the link feature anymore. The best solution would be to use a common email and link the devices using Supercell ID.