Can't create a new API key for existing user (maybe bug)

@simon @pfaffman I’m new to discoure can you guys please help me to go through.
I’m encountering a issue while creating the new API and I’m providing each data to respective field . I’m uncertain if these issues are maybe because of Data explore Plugin because I don’t heave subscriptions for it . I’m in the process of generating my first user API key but again I’m getting 403 error.

Also, I have to connect this directly into my Power BI dashboard. Any help really helpufull.

Thanks in advance.