[Cloudflare One] Add Okta Enhanced Dynamic Zone troubleshooting

[jroyal]

Summary

Adds a troubleshooting section to the Okta OIDC identity provider page for a known issue where Okta's Enhanced Dynamic Zone (DefaultEnhancedDynamicZone) with ALL_ANONYMIZERS blocks Cloudflare IP addresses, causing Access logins to fail. Includes the error users see, what to look for in Okta logs, and the workaround (adding Cloudflare IPs to the exempt list).

Documentation checklist

• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

💡 1 suggestion found in commit bc02728.

Suggestions (1)

File	Issue
cloudflare-one/integrations/identity-providers/okta.mdx line 203	Lists: fewer than three items — The patch adds a bulleted list with only two items (lines 203–204). Fix: Consider rewriting the two alternatives as prose instead of using a bulleted list.

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