[問題] 關於同時充電iphone和apple watch

買了studio A自己出的雙type-c充電頭
單充是40W 雙充個別最高20W
想同時充iphone和apple watch
卻發現只要apple watch在充電
手機就會顯示充電中但其實無法充電
嘗試同時充兩支iphone就沒有問題
所以想請問是apple watch充電線的問題嗎？
搜尋網路上都沒有相關討論
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