Bedrock Runtime returns "ValidationException: Operation not allowed" for all models

The error ValidationException: Operation not allowed in Amazon Bedrock generally signifies that the account lacks the necessary model access permissions, even when the models appear as ACTIVE. This behavior has been observed by multiple users, particularly following the removal of the legacy “Model Access” page. According to AWS guidance, administrators should verify model access permissions through the Bedrock console and, if access remains unavailable, escalate the issue by submitting a support case to AWS.

https://docs.aws.amazon.com/bedrock/latest/userguide/inference.html

https://github.com/aws/aws-cli/issues