"In order to call this API endpoint, user needs to have [Meetings] permission" - how do I add permissions?

Hello,

I'm trying to create a meeting with our sandbox account following this guide.
https://developers.ringcentral.com/guide/meetings/quick-start/node

However, I receive this error "In order to call this API endpoint, user needs to have [Meetings] permission"

I found this issue where there meeting permissions weren't added to the user's sandbox account, is it possible this is the same issue? Is there a way for me to check / add perms to my sandbox account?

Thanks!
-Rob