Azure Functions Flex Consumption: persistent HTTP 429 when creating plan in Italy North after waiting over 48 hours

Gianclaudio Lanzone 0 Reputation points
2026-09-04T23:26:33.49+00:00 
I cannot create an Azure Functions Flex Consumption plan in Italy North because Microsoft.Web returns:

“App Service Plan Create operation is throttled for subscription. Please contact support if issue persists.”

Timeline:
- September 2, 2026: deployment was blocked by HTTP 429 / extended code 51025.
- After waiting more than 48 hours, I made one controlled attempt on September 5 (local time).
- The same HTTP 429 occurred. I canceled the deployment and stopped further attempts.

Configuration:
- Azure Functions Flex Consumption (FC1)
- Region: Italy North
- Python 3.12
- 512 MB memory, maximum 1 instance
- Deployment through Azure CLI using a workload-specific Bicep template

Bicep compilation, ARM validation and what-if succeeded. Existing Function Apps remain deployed; the new plan and Function App have not been provisioned.

Latest failed operation:
- UTC timestamp: 2026-09-04T23:02:15.587092+00:00
- Correlation ID: 816e64ed-367e-4e8e-a1b1-c41d23170996

The Azure support flow requires a paid technical support plan.

Could a Microsoft moderator help clarify:
1. How can I determine when this Microsoft.Web creation throttle expires?
2. Can Microsoft investigate or clear a persistent throttle through a channel available without a paid support plan?
3. Is any additional diagnostic information needed to distinguish this throttle from a regional capacity or quota restriction?

I would like to retain the existing region and Flex Consumption configuration.
Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

0 comments

1 answer

Sort by: Oldest
Most helpful Newest Oldest
  1. SHOUMIK CHAKRAVARTY 575 Reputation points
    2026-09-05T03:02:23.2833333+00:00

    I'm a community volunteer rather than a Microsoft moderator, so I can't look up your correlation ID or see the throttle state on your subscription. But two of your three questions I can help with.

    1. There's no published expiry for Microsoft.Web creation throttles. Yours surviving more than 48 hours is the interesting part, since these are normally short-lived. Lead with that in the ticket.

    2. You don't need a paid plan, and I suspect that's what's blocking you. From Microsoft's support guidance:

    "Azure provides unlimited support for subscription management, which includes billing, quota adjustments, and account transfers. For technical support, you need a support plan."

    A creation throttle is quota-adjacent rather than a code fault, so it's worth raising under Subscription Management before accepting that you need a paid plan. If the portal starts steering you toward a support plan, the issue type has been classified as technical, so go back and change it.

    3. Your error already says "throttled for subscription" with a 429, which is a rate limit on your subscription rather than anything about Italy North. If you want to be certain before raising the ticket, try the same plan in another region. Fails everywhere, it's the subscription. Works elsewhere, look again at Italy North.

    Help make this community better for everyone: if this answer resolved your issue, please accept it or leave an upvote. If not, share more details in a comment so we can continue the discussion and find the right solution.

    Was this answer helpful?

    1 person found this answer helpful.

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.