ISO 8601 Time Format in Python Error: 'timestamp must follow ISO8601'

[FA5I]

Hey Folks,

I am calling this function in the API:

from sp_api.api import Orders
from dateutil.parser import parse
from helpers import calc_start_date
import datetime

# This works
Orders().get_orders(CreatedAfter=parse("2021-03-23T19:45:13.864378")).payload

# This fails
Orders().get_orders(CreatedAfter=parse('2019-01-22T16:31:08+00:00').isoformat()).payload

The fail message for the latter is:

sp_api.base.exceptions.SellingApiBadRequestException: [{'code': 'InvalidInput', 'message': 'timestamp must follow ISO8601', 'details': ''}]

Can someone who has experienced this before please explain what is going on? The latter date is isoformat from my understanding and should work with the SP-API.

I can get around this by removing the "+00:00" at the end of the time string, but it seems a bit strange that the Python isoformat doesn't work directly with the API endpoint.