Access denied in creating lambda function

Hello.

If your AWS account is managed by Organizations, please check that Lambda operations are not prohibited by SCP.

If you cannot operate it even as a root user, there may be a problem with your AWS account.
Therefore, please contact AWS Support by opening a case under "Account and billing".
Inquiries under "Account and billing" can be made free of charge.
https://docs.aws.amazon.com/awssupport/latest/user/case-management.html