multiple redirect URI's in ADFS app registration for SPA.

Question

hi Team,

I have two SPA's like www.firsttest.example.com and second is www.secondtest.example.com. They are registered under same tenant . I did only one app registration so under same client Id only I add 2 redirect URI's first is "firsttest" and second is "secondtest".

Now user initiate login process through firsttest and it has a link for secondtest site , so do we need to pass any security token from "firsttest" to "secondtest" and validate that in secondtest app to use it there OR we should initiate secondtest own login process like authorize call to adfs server.

And in this scenario will secondtest work as independent application as well or not , and if it is how we can restrict that.