Unable to deploy Claude Opus 4.8 in East US 2 — “Page not found” error after clicking Deploy Mode

Question

Unable to deploy Claude Opus 4.8 in East US 2 — “Page not found” error after clicking Deploy Mode

Ahmed Jama 26

Description: I’m trying to deploy the Claude Opus 4.8 model in Azure AI Foundry, which is listed as an available model in the East US 2 region. However, the deployment flow fails with a “Page not found” error.

Steps to reproduce:

Open Azure AI Foundry

Go to Compare models

Select Claude Opus 4.8

Click Deploy Model

The portal redirects to a broken page and shows:

Page not found The page you are looking for does not exist or has been moved. Please check the URL or return to the homepage.

Expected behavior: The deployment wizard should open and allow me to configure and deploy the model.

Actual behavior: The portal shows a “Page not found” error immediately after clicking Deploy Model.

Region: East US 2

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Answer 1

Ahmed Jama hi & thx for sharing urs issue here at Q&A portal,

portal issue rather than a problem with the model itself. A 'Page not found' immediately after clicking Deploy Model usually means the portal generated an invalid or stale URL. Since the failure happens before the deployment wizard even opens, it's unlikely to be related to quota, permissions, or model configuration.

I'd try the usual portal checks first

-open Azure AI Foundry in an InPrivate/incognito window.

-try a different browser.

-clear the portal cache & verify you're using the correct AI Foundry project and subscription.

Try deploying the model directly from the Models page instead of Compare models, if available. If the same model is available but the deployment link consistently returns Page not found, I'd consider this a portal regression. A Microsoft moderator should be able to confirm whether there's an ongoing issue with the Claude Opus 4.8 deployment flow in East US 2. If you open a support request, include the region, subscription ID, AI Foundry project, timestamp, and a screenshot or HAR trace if possible. That will help the product team identify the broken portal route.

rgds,

Alex

&

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and at my blog https://ctrlaltdel.blog/

Ahmed Jama 26 Reputation points

2026-07-09T07:42:31.3166667+00:00

Hi @Alex Burlachenko ,

Thanks for the guidance — appreciate you taking the time to look into this.

I managed to deploy the model successfully by using the direct model deployment option. That flow works fine.

However, the Deploy Model button under Compare models still consistently throws the “Page not found” error, especially when using the default deployment settings. When I switch to custom settings, the Compare Models deployment path still fails in the same way. So the issue seems isolated to that specific portal route rather than the model itself.

It might be worth having the Azure AI Foundry team review that path, as it looks like a portal regression