AWS requires that all AMI images have a unique name. If you attempt to create an AMI image with the same name as an existing image, the following error will occur:

AMI name <some name> is already in use by AMI ami-12345678

To resolve this issue, create AMI images with unique names.

If using Skeddly actions to create your AMI images, you can use the $(DATE) macro in the Image Name  field to generate a unique name each day.

If you are using Managed Instances to create your AMI images, you can use the same $(DATE)  macro in the Backup Name  field.