SwiftUI - open link from my website in the app - swiftui

Question

I have one SwiftUI - iOS app running, and I need to open the link from email/whatsapp/etc in my app.
So lets say the link is like this (from my website):
https://www.mapplebook.com/welcome;id=123
I have tried the custom Scheme, which works fine, but for that i need to do something like: myScheme://www.mapplebook.com/etc....
Which is bad because Website and Android only understand things without the scheme.
The universal link looks like the best approach, I read a couple of things about Apple docs and some other questions, but could not make it work. :(
Is there any suggestion? Maybe some tutorial that I am missing.
Any help is much appreciated.
Editing the question as requested:
This is my info.plist - In this case I am using the custom scheme mapplebook
In SceneDelegate.swift, I have the followng:
func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
guard let url = URLContexts.first?.url else {
return
}
if let range = url.absoluteString.range(of:"https//www.mapplebook.com/id=") {
let sharedtoken = url.absoluteString[range.upperBound...]
//with sharedtoken i can redirect internally and open the correct view - working okay
}
}
But, as mentioned, that uses scheme mapplebook right?
Is it possible to have something like in android, where we say like:
android:host="mapplebook.com"
android:pathPattern="/something"
android:scheme="https" />
So it ask to open the https://mapplebook.com/something url in my app.
Thank you Koen for helping.