Invalid Authorization error in API

API Issues
#1

I am getting below error when calling API ‘https://api.company-information.service.gov.uk/company/01234567/persons-with-significant-control’

{
“error”: “Invalid Authorization”,
“type”: “ch:service”
}

I have passed api key in ‘Authorization’ key as 'Bearer ’ + [API Key]
I have also tried to do base 64 encoding then passed api key and also tried by selecting basic authentication and provided username and password still getting same error.

#2

Is that the streaming API and did you remember to place the colon before base64 encoding?
Refer to the documentation (Using basic Authentication towards the bottom) Streaming API: (company-information.service.gov.uk)