記者ハンドブック

共同通信の記者バンドブックでは漢字はいくつかの例外を除いて常用漢字。常用でも母校教育大附属の附は使えないとある。固有名詞は例外か？

According to the Kyodo News reporter handbook, they are supposed to use Common kanji with a few exceptions. They say even if the kanji 附, that is a part of the name of my Highschool is Common kanji, you can’t use that kanji. Are proper nouns are exceptions?