Remove second S3 access keys before reverting from ONTAP 9.19.1
If you upgraded to ONTAP 9.19.1 and added a second S3 access key to any user, these keys must be removed before you can revert to an earlier ONTAP release.
Steps
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Show S3 access keys to determine if second access keys have been added for any S3 users.
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Remove the second access keys for all S3 users.