Can't create crawler at AWS Glue by root account.

If your account is part of an AWS Organization, the root account actions could potentially be restricted by a Service Control Policy (SCP) set by the Organizations administrator. Additionally, please verify that your IAM permissions allow creating a Glue crawler, and check if any AWS Organizations service control policies (SCPs) may be restricting this action (if applicable).

If you have the required permissions above, I would suggest opening up a support ticket with AWS.

In general, it is best practice not to use the root account for day-to-day tasks. Instead, I would recommend using IAM users, IAM roles, or AWS SSO users which allow you to implement least privilege access.