You can’t deep-link from mobile web directly into the Spotify app for OAuth.
Web must use the normal accounts.spotify.com flow; only native apps can use app-based authorization.

Spotify’s SDKs and authorization endpoints explicitly separate:

• Web apps: use https://accounts.spotify.com/authorize

• Mobile apps: use the Android/iOS SDKs or system browser OAuth (Custom Tabs / SFSafariViewController)

There’s currently no public Spotify URI scheme or intent that performs OAuth for browser-based clients.

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