By default all UW AWS accounts will be accessed using NetID authentication. This extends the security provided by NetID authentication & Multi-factor Authentication to UW AWS accounts. (AWS - Sign In to the AWS Management Console )
AWS authorization groups are managed using the campus Manifest service.
Your collaborator can then be added to an existing Manifest group, or you can create a custom Role & Manifest group:
NetID login is handled using an identity provider and does not create a native IAM user account within Amazon. IAM users are most frequently used as service accounts to run processes. If it is necessary to create an IAM user, please review Security best practices in IAM, in particular using the principle of least privilege.
This account should be secured with Multi-Factor Authentication (MFA) to comply with UW System authentication standards.
See AWS - Sign In to the AWS Management Console for information on how to log in with an IAM user