The following basic restrictions apply to ACM Certificate tags:
The maximum number of tags per ACM Certificate is 50.
The maximum length of a tag key is 127 characters.
The maximum length of a tag value is 255 characters.
Tag keys and values are case sensitive.
aws:prefix is reserved for AWS use; you cannot add, edit, or delete tags whose key begins with
aws:. Tags that begin with
aws:do not count against your tags-per-resource limit.
If you plan to use your tagging schema across multiple services and resources, remember that other services may have other restrictions for allowed characters. Refer to the documentation for that service.
ACM Certificate tags are not available for use in the AWS Management Console's Resource Groups and Tag Editor.