You can request additional quota increases by emailing supportops@databricks.com & help@databricks.com

• Subject line - "AI Search endpoint quota increase request"
• Include workspace ID, region, requested limit, screenshot and justification

You can reference these points in it

• Documentation states limit should be 500 per workspace. More details here
• Workspace shows limit of 1 (which matches Free Edition, not Premium)
• You're on a Premium tier workspace in Azure
• Error Request ID - c5164f0c-37dc-4f7a-9fd3-b0fa4a8578f9
• Trace id - 1ddbe0465dfd468d7852711dd2fd4c9a
• Workspace ID - 

Ask them to investigate if your workspace was misconfigured with Free Edition quotas after the June update