Multiple users on Google Home

[UN1FORM]

I have recently moved from Prime Music Unlimited Family Plan to Spotify Premium family plan and I have lost all functionality of multiple users using their own accounts. While I consider myself tech savvy I hope it's something I'm doing wrong otherwise I'll be going straight back to Prime. We all have our accounts linked to our Google Home Apps and voice match is enabled for everyone. My partner will verify by asking what's on her calendar and get the personalised results but when she asks for a playlist it starts playing from my Spotify account. I have seen from other posts that this is being blamed on Google but when I used Prime Music it all worked exactly as expected with multiple users so this does seem to be able at the Spotify end. Hopefully there is something I'm missing and any advice is appreciated.