Once you are connected to your ODBC Data source via an Oracle tool like SQL Plus, you can perform updates by using a query passthrough approach to push the update to the data source. Try pushing your update in the following format:

DECLARE
  c  INTEGER;      -- Cursor ID for passthrough
  nr INTEGER;      -- Number of rows affected
BEGIN
  -- Open a passthrough cursor on the remote DB (via DB link)
  c := DBMS_HS_PASSTHROUGH.OPEN_CURSOR@<db_link>;

  -- Prepare the SQL statement with placeholders
  DBMS_HS_PASSTHROUGH.PARSE@<db_link>(c,
    '<your SQL statement with placeholders, e.g., UPDATE ... SET ... WHERE ...>');

  -- Bind variables (starting at position 1)
  DBMS_HS_PASSTHROUGH.BIND_VARIABLE@<db_link>(c, 1, <value1>);
  DBMS_HS_PASSTHROUGH.BIND_VARIABLE@<db_link>(c, 2, <value2>);
  -- Add more binds as needed...

  -- Execute the non-query (INSERT/UPDATE/DELETE)
  nr := DBMS_HS_PASSTHROUGH.EXECUTE_NON_QUERY@<db_link>(c);

  -- Optionally display number of affected rows
  DBMS_OUTPUT.PUT_LINE(nr || ' rows updated');

  -- Close the passthrough cursor
  DBMS_HS_PASSTHROUGH.CLOSE_CURSOR@<db_link>(c);
END;

You can use this procedure to execute a parameterized SQL statement (e.g., an UPDATE) on a remote non-Oracle database via a database link. 

Please make sure to replace <db_link> with the actual name of your database link (e.g., @myd365db).

This template supports UPDATE, INSERT, or DELETE statements.