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- First verify if EC2 instance where you are mounting EFS have permission to access EFS. If you have role attached to EC2, attach permission to that role. Otherwise create new role with permission and attached role to EC2 instance.
- make sure Security group of EFS allows access to EC2 Security group.
- If above two requirement are there, follow : https://docs.aws.amazon.com/efs/latest/ug/wt1-test.html
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Can you please elaborate on the first point. I do not understand what you mean by role attached to EC2 and permission attached to role. I am pretty new to AWS.