I'm in the USA and none of Zara Larsson's music is available here. That might be why you are having trouble.
The country in your Spotify account settings have to match the credit card that you are using to pay your subscription.
You will most likely run into problems if you are trying to use a different country other than the one you live in.
If you still run into trouble,
I suggest you contact support so they can take a look at your account and help:
If you get an automated reply email, you need to reply back to it.
Support usually replies within 24-48 hours.
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Note: I'm not a Spotify employee.