not_upgradable

This subscription can't be upgraded right now.

HTTP 409.

Likely causes:

• There is no free trial or active subscription to upgrade.
• A payment is overdue.

What to do: Start a subscription, or settle the overdue payment, then try again.

Retry: No. The same request gets the same answer; change something first.

Listed under Billing, slots and dedicated IPs in Errors. Send the error’s requestId to support and we can find the request.