Echo Spotify activity popping up on my phone

[Jamieboo]

Hello there

Some time ago I bought my elderly parents an Amazon Echo and set up a Spotify account for my Mum.
It's been great, and proved very useful to calm Dad down with soothing music when his dementia makes him a bit agitated.
I set it all up for Mum using the Spotify app on my Samsung Galaxy S20 FE.
But suddenly, just in the last couple of days, I get sort of pop-ups on my phone telling me what is 'Now playing' an my Mum's Echo.
The Spotify app on my phone is logged into my Mum's account that I set up for her, and I would prefer to keep it like this if I need to go into it and help her with anything. But I don't want/need to see popups - outside of the app - telling me what she's playing.
I've disabled notifications for Spotify, but it keeps happening.
Earlier today I had a Zoom meeting, and in preparation for this I turned all my volumes up on my phone. Then, seconds later, I get a call from Mum saying that her house was suddenly filled with deafening Perry Como!
How can I turn this feature off? I don't want to log out of mum's account, I just don't want this strong connection between Mum's Echo and my phone!

Help!

Thanks