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Hi K,
715-123420 is a fraud/risk protection block (RTFP) on the Foundry model deployment, not a normal GPT-5-mini quota or RBAC error.
There is no portal or CLI setting that can remove this block. Changing the model, region, SKU, or recreating the Foundry project will not clear it.
Since the message specifically says to contact support, the subscription/account needs to be reviewed by the Microsoft team handling the risk restriction. Include the 715-123420 error, subscription ID, Foundry resource/project, region, and the UTC timestamp of the failed deployment.
Do not create another subscription to work around the restriction.