Magento 2.3.5 klarna invalid form key

Question

On my site https://www.nattklubbar.net/se I have installed latest klarna checkout along with magento 2.3.5 and I have a problem with invalid form key once placing the order.

From Klarna logs response:
Date: Sun, 16 Aug 2020 17:54:43 GMT
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Set-Cookie: mage-messages=%5B%7B%22type%22%3A%22error%22%2C%22text%22%3A%22Invalid+Form+Key.+Please+refresh+the+page.%22%7D%5D; expires=Mon, 16-Aug-2021 17:54:43 GMT; Max-Age=31536000; path=/
Pragma: no-cache
Cache-Control: max-age=0, must-revalidate, no-cache, no-store
Expires: Fri, 16 Aug 2019 17:54:43 GMT
X-Magento-Tags: FPC
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Location: https://nattklubbar.net/se/
X-UA-Compatible: IE=edge
CF-Cache-Status: DYNAMIC
cf-request-id: 049a01def5000000523aac1200000001
Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
Server: cloudflare
CF-RAY: 5c3d05ab28530052-LHR

I have tested Klarna and Magento 2.3.5 on a fresh magento installation and it works. So I think it has to have something to do with the enviornment of my magento , cookie domains etc.

Anyone that could help?