Nodes web api controller: illegal base64 data at input byte xx

Remember my post here?

Now I have created an API key with the docker exec -it storagenode /app/storagenode info command. When I try to add the API data into multinode via Powershell cli multinode add then I get this error message: Error: illegal base64 data at input byte 17. I have tried 2 times and received this error both times.
Then I created the API secret with docker exec -it storagenode /app/storagenode issue-apikey and I was able to add it to Multinode with the same previous command instantly without error message.