Claude Sonnet 4.6 access request ends with "Service unavailable" after submitting approval form

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Project type: Personal Google account (no organization)

Project ID: (PII Removed by Staff)

I successfully completed the following steps:

  • Billing enabled

  • Agent Platform API enabled

  • Access to Agent Platform

  • Access to Model Garden

  • Claude Sonnet 4.6 visible in Model Garden

When I open Claude Sonnet 4.6 and complete the Anthropic access request form, the form accepts all required information and proceeds normally.

However, after clicking Next/Submit, I am redirected back to Agent Platform and receive the message:

“Service unavailable at this time”

I cannot determine whether the access request was actually submitted, rejected, or is pending review.

Additional information:

  • Personal Google account

  • No Google Cloud organization attached (“No organization”)

  • Billing account active

  • Agent Platform API already enabled

  • Country: Nicaragua

Has anyone experienced this issue with Claude Sonnet 4.6 access requests through Agent Platform?

Is this a known issue, a limitation for personal accounts without an organization, or a problem in the approval workflow?

Thank you.

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