Hi! To switch out access keys, check out AWS's documentation on managing access keys: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_access-keys.html#Using_CreateAccessKey.
Keep in mind that Access Keys have 2 parts: an access key ID and a secret access key. The only time you can view the secret access key is when it is initially created. Outside of that, you cannot view it again.
For more help troubleshooting with WorkMail: https://docs.aws.amazon.com/workmail/latest/adminguide/security_iam_troubleshoot.html
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