Most of the time it can be recovered. Please read the Lost Accounts guide on how to find it.
Go into the "Network & Internet settings" > "Change adapter settings" and then right-click the network adapter you use to connect to the internet and select "Properties" then double-click on "Internet Protocol version 4" and set it to "Obtain DNS server address automatically" Please make sure that you are running 2019.8 or later of our Mullvad VPN app, since that version should fix that specific issue.
Open the app's Settings, then click on Preferences and turn on Local Network Sharing.
Try connecting over TCP and port 443. This often helps.
How to use the Mullvad VPN app.
How to proceed if you have lost your account number.
Step 1 in our online privacy series, this guide focuses on the first steps to take to improve your online privacy.