For what I've seen the verification process works perfectly fine when using a passport. However, when using a national ID, the process fails with ERROR_NOT_READABLE_ID.

Is it possible the process expects a specific ID format? For example only U.S. (or other single country) ID or driving license? I'd guess there's no issue when using a passport because its format is more standard internationally.

If Jumio expects only some specific format, it should be clearly stated.