Bug Description

Sometimes the authentication service returns an error about a missing verification nonce (see https://wordpress.org/support/topic/missing-parameter-verification_nonce/).

This happens whenever site verification has failed for some reason, because when that happens, the user can try to re-do the step again (for which the verification nonce would be required again).

Therefore we need to also send the verification_nonce parameter in the handler where we send verify=true.

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Acceptance criteria

• When redirecting the user back to the proxy to check site verification, a verification_nonce parameter should be sent.
• Failing site verification on the proxy should not result in a missing parameter: 'verification_nonce' error.

Implementation Brief

In

pass a missing_verification string as second parameter to get_proxy_setup_url(), so that it is correctly added by the logic in .

Changelog entry

• Fix bug where the site verification nonce was not sent to the authentication service.