Okta backend error after upgrade to vault 1.4

[moskitone]

Describe the bug
Seems like okta backend is broken after #8143

* Okta auth failed: Post https://***.okta.comauthn/factors/*****/verify: dial tcp: lookup ***.okta.comauthn on 10.250.244.10:53: no such host

It looks like smth wrong with ulr. There is no "/" in path https://github.com/hashicorp/vault/blob/master/builtin/credential/okta/backend.go#L183
but here is
https://github.com/hashicorp/vault/blob/master/builtin/credential/okta/backend.go#L103

To Reproduce
Steps to reproduce the behavior:

1. Run vault login -method=okta username=*** password=***
2. See error

Environment:

• Vault Server Version (retrieve with 1.4):

Additional context
Add any other context about the problem here.
This behaviour is only in vault 1.4
Vault 1.3.4 works perfect

[ncabatoff]

Hi @moskitone,

Thank you for the bug report. I agree with your analysis. I will work on a fix which will hopefully appear in the next point release.