Webhook Notifications Not Working & “Webhooks” Tab Missing in Partner Center

Hello,
I’m seeing two related issues in my Sandbox Partner Center:

  1. No webhook callbacks ever reach my endpoint when I trigger transactions in the sandbox.
  2. Overnight, the entire Webhooks configuration tab has disappeared from the Partner Center UI.

Environment

Workspace: Fireblocks Sandbox (Partner Center)

API Version: v2 Webhooks (beta)

Subscribed Events: transaction.created, transaction.status.updated

Questions:

What might cause the Webhooks tab to vanish?

How can I restore webhook delivery in my sandbox workspace?

What additional logs, IDs, or screenshots would help troubleshoot?

Thank you in advance for your assistance!