ncw
(Nick Craig-Wood)
4
It has the header.
When you tried it with rclone ls magentacloud: -vv --dump headers,auth it should have looked something like this.
Authorization: Basic dXNlcjpwYXNz
So I guess your server is expecting
Authorization: Bearer
Or possibly you are supposed to get a bearer token and use it as the password. See this thread - someone did get it working.