Error 403 Forbidden when adding Google Cloud account and trying to select a bucket

Hi - I am trying to add our Google Cloud storage account by selecting the JSON file that Google provided me. I browse for the JSON file but then when I click the drop down to select the bucket I get error 403 forbidden. Full error attached in the screenshot.
Does anybody have any ideas please?
Thank you

Looks like the user you created in Google Cloud doesn’t have enough permissions to list buckets in your storage account.

Have you tried Access and Secret Keys to authenticate?

Thank you for replying. Yeah I ended up using Access/Secret key instead. I did add a comment here previously just in case it helped anybody else but for some reason it needs to be approved and isnt displaying. But I’m sorted now thank you.