Push notification MFA fails with: KeyError: 'next'

[MattTheRed]

Describe the bug
The CLI is failing on the MFA step with a "next" keyerror. Oddly enough when I put a breakpoint in, I see that resp_json['_links']['next']['href'] is in fact set.

To Reproduce
Steps to reproduce the behavior:

1. Run okta-awscli --debug

Expected behavior
Should not fail on MFA step

Output

okta-awscli --debug
DEBUG - Setting AWS role to arn:aws:iam::546291546746:role/staging-mmoore
DEBUG - Setting AWS partition to AwsPartition.AWS
DEBUG - Setting MFA factor to OKTA
ERROR - The app-link is missing. Will try to retrieve it from Okta
INFO - Authenticating to: galileo.okta.com
INFO - Authenticating as: mmoore@galileo.io
Enter password: 
ERROR - Unsupported factorType: sms
INFO - Using pre-selected factor choice                                          from ~/.okta-aws
INFO - Performing secondary authentication using: OKTA
DEBUG - {'id': 'opf1395moyZwb1PLX4h7', 'factorType': 'push', 'provider': 'OKTA', 'vendorName': 'OKTA', 'profile': {'credentialId': 'mmoore@galileo.io', 'deviceType': 'SmartPhone_IPhone', 'keys': [{'kty': 'EC', 'use': 'sig', 'kid': 'default', 'x': 'Sdnlgvi62N1b5KyDKgEoT-mH59N2HTDcaBiIFcG--GQ', 'y': 'E5CBsNP1hJ07ZZTEHmOts-W9gOxbnEZ8eT_GoWgQKPs', 'crv': 'P-256'}], 'name': 'Matt’s iPhone', 'platform': 'IOS', 'version': '14.8.1'}, '_links': {'verify': {'href': 'https://galileo.okta.com/api/v1/authn/factors/opf1395moyZwb1PLX4h7/verify', 'hints': {'allow': ['POST']}}}}
Waiting for push verification...
Traceback (most recent call last):
  File "/Users/matt/.pyenv/versions/3.8.0/bin/okta-awscli", line 8, in <module>
    sys.exit(main())
  File "/Users/matt/.pyenv/versions/3.8.0/lib/python3.8/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/Users/matt/.pyenv/versions/3.8.0/lib/python3.8/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/Users/matt/.pyenv/versions/3.8.0/lib/python3.8/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/matt/.pyenv/versions/3.8.0/lib/python3.8/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/Users/matt/.pyenv/versions/3.8.0/lib/python3.8/site-packages/oktaawscli/okta_awscli.py", line 141, in main
    get_credentials(
  File "/Users/matt/.pyenv/versions/3.8.0/lib/python3.8/site-packages/oktaawscli/okta_awscli.py", line 36, in get_credentials
    _, assertion = okta.get_assertion()
  File "/Users/matt/.pyenv/versions/3.8.0/lib/python3.8/site-packages/oktaawscli/okta_auth.py", line 153, in get_assertion
    self.session_token = self.primary_auth()
  File "/Users/matt/.pyenv/versions/3.8.0/lib/python3.8/site-packages/oktaawscli/okta_auth.py", line 59, in primary_auth
    session_token = mfa_base.verify_mfa(factors_list)
  File "/Users/matt/.pyenv/versions/3.8.0/lib/python3.8/site-packages/oktaawscli/okta_auth_mfa_base.py", line 73, in verify_mfa
    session_token = self._verify_single_factor(supported_factors[factor_choice])
  File "/Users/matt/.pyenv/versions/3.8.0/lib/python3.8/site-packages/oktaawscli/okta_auth_mfa_base.py", line 103, in _verify_single_factor
    resp_json['_links']['next']['href'], json=req_data)
KeyError: 'next'

Environment (please complete the following information):

• OS: MacOS, python 3.8
• Version of okta-awscli you're running. 0.5.3

Additional context

[maxtacu]

Hey @MattTheRed can you check please if the issue persists with the latest version 0.5.4?