My Spotify cannot be played on Google Home suddenly. Tried many methods but none of them worked. Finally, I found a converter to help me play Spotify on Google Home. Use a Spotify MP3 Downloader to download Spotify to MP3. Here are the procedures.
First, launch a Spotify downloader such as TunesKit. Drag the Spotify songs to this converter.
Choose the format for your Spotify songs by clicking the Format button. Click the Convert button.
Then transfer Spotify songs to Google Home.