Hi @akhilendu.vikas , Welcome to UiPath Community!
May be you have to log in into automation cloud first and after that you have to copy the link as your service URL. Here you have only used the cloud address, not your service URL, may be that why nothing is happening.
First sign in on local browser, then click on sign In. One pop-up will appear on browser, click allow/open.
I had already signed in to cloud.uipath but still the sign in button not working
I followed your steps but still sign in button not working
I am also facing the same problem… using Windows 10 and Edge.
A reboot fixed it for me… hope that helps others.