Kindly proxy approve (this) since the approver is absent due to business trip.
Please proxy approve this as the authorizer is out of office and not available.
ご質問ありがとうございます。
代理承認:proxy approval
承認者:approver, authorizer, approval holderとも言えます。
例:
1. The head (manager) of Finance department is not available. I wonder, who can give proxy approval?
経済部の部長が不在なので、代理承認は誰ができますかね。
2. After manager its the deputy manager (who can proxy approve)
部長の次は課長になります。
お役に立てば嬉しいです。