I received an email with the following content: "The [team-name] team recently had a request to add a 6th member but your Free plan only allows up to 5 so we were unable to add them. "
However, when I go to bitbucket.org -> "Workspace settings" -> "Plan details" it says (as expected): "You're on the Bitbucket 100 Users Premium (annual) plan."
Why did I get this email?