I am running V4 and want to upgrade to v5. When I click the migrate button in settings and input my url, email and password and then click next I get the error page. I dont see an API key in my .env file to put so I leave that blank,
I did run the /update to try to fix this but nothing happned. cleared the cache was about it.
Edit: This is a new install with one client, one recurring and one product. It is also running inside of a docker container.