This feature is often not functional in many MOD versions because it requires server-side validation from Spotify. Significant Risks & Disadvantages Using a modified APK is a "gamble for your digital safety".

Removes all visual and audio advertisements for uninterrupted music.

Check the latest experimental build which has come out on xManager. I think it has come today only. Version number is 8.9. 98.488. Reddit·r/xManagerApp Spotify Mod 8.10.9.722 APK For Android | Download

[Question] is any Spotify mod working right now ( premium features)

Spotify Premium MOD APKs, including version 8.7.88.496, are unofficial, modified versions of the official Spotify app designed to bypass subscription fees and unlock premium features. While they offer enticing benefits, they carry significant security, legal, and reliability risks. Key Features of Spotify MOD APKs