Visit your Album Page on the Spotify desktop app (not the web version)
Click the three dots (“…”)
Click “Share”
Click “Copy Spotify URI”
Example screenshot:
Optional reading:
A Spotify URI is a link that you can find in the Share menu of any track, album, or artist page on Spotify. When a user clicks a link that consists of a Spotify URI (rather than an URL/HTTP address), they’re taken directly to the Spotify application, without having to go through the web page first