承認 and 許可: approving a proposal and permitting an action
Compare plan approval with permission to take photographs, keeping the scope of each authorization clear.
Accepting a plan or application
承認, read しょうにん, means accepting or approving a plan or application. 会議で新しい計画が承認されました。 says that the new plan was approved at the meeting.
申請はまだ承認されていません。 says that the application has not yet been approved. Read まだ together with the negative form.
Allowing an action
許可, read きょか, means permission for an action. この部屋での撮影には許可が必要です。 says that taking photographs in this room requires permission.
管理者から使用の許可をもらいました。 says that permission to use something was obtained from the administrator. The context or permission details identify what may be used.
Overlap and the scope of permission
Accepting an application and permitting an action may happen together, so the words can overlap. Look for whether the focus is approval of a proposal or permission for an action.
計画は承認されましたが、撮影の許可はまだです。 says that the plan was approved, but photography permission is still pending. Plan approval does not establish photography permission.
Is photography also permitted in 計画は承認されましたが、撮影の許可はまだです。?
Show the answer and why
That has not been established. The sentence separates plan approval from photography permission and says the latter is still pending.