Typescript 元素隐式具有任何类型，因为字符串类型的表达式不能用于索引类型.如何解决

I want to manage closing a modal by click not only button and also to substrate. In JSX without Typescript this code works good. This example returns to me couple errors in line:
if (universalRegExp.test(String(appointment[key])))

1. 元素隐式具有""any""类型，因为类型为""字符串""的表达式不能用于索引类型""{Customer:String；Document:Strong；Memment:String；}"".""
2. 在类型‘{Customer:String；Document:String；Procment:Strong；}’上找不到参数类型为‘字符串’的索引签名.

What I do wrong?
Thanks.

ModalEdit.tsx个

interface ModalEditI {
  id: string;
  setList: () => void;
}

const ModalEdit: FC<ModalEditI> = ({ id, setList }) => {
  const store = useContext(Context);
  const universalRegExp = /^[а-яА-Яa-zA-Z\s.]{2,30}$/;
  const date = store.stateFields.date;
  const { customer, doctor, complaint } = store.stateFields;
  const [appointment, setAppoint] = useState({
    customer,
    doctor,
    complaint
  });

  const confirmHandler = async (id: string) => {
    let counter = 0;
    for (const key in appointment) {
      if (universalRegExp.test(String(appointment[key]))) { // <--There is problem
        counter++;
      }

      if (counter === 3) {
        editAppoint(id);
        store.setTypeOfTask('');
      }
    }
    if (counter !== 3) {
      store.snackHolder('wrong simbols');
    }
  };

  const editAppoint = async (id: string) => {
    await store.editAppoint(id, appointment, date);
    const appointments = await store.getAppointments();
    setList(appointments);
  };

  const cancelHandler = (e) => {
    if (e.target.dataset.close === 'closeThis') {
      store.setTypeOfTask('');
    }
  };

  return (
    <div 
      className='modal_substrate'
      data-close='closeThis'
      onClick={cancelHandler}
    >
      <div className='modal bigger'>
        <div className='modal_header'>
          <h1 className='modal_head_text'>Edit count</h1>
        </div>
          <button data-close='closeThis' onClick={cancelHandler}>
            Отмена
          </button>
          <button onClick={() => confirmHandler(id)}>Confirm</button>
      </div>
    </div>
  );
};