Hi there @kini,
thanks for reaching out to the community !
You can read more about the behavior of Facebook and Spotify when connected, visiting this info page.
In addition, in order to have better knowledge on the change of email, please make sure to check out this help page.
On top of all that, it's important to mention that Spotify is not recommended used by VPN connection - may create issues or errors like the one you're getting at the moment.
In order to use the app properly, please make sure to use a solid WiFi connection or a LAN/network.
Hope this shed some light.
Let me know if you have any further questions 🙂