Hello @Thompson, Elonna,
Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.
We got a suggestion from one of the OP, The issue was resolved by following the below steps, we have requested to add the same IAM role, and after adding the IAM role, issue got mitigated.
"Assigned the Reader IAM role to a group of users for the server vnets" Since then, you can be able to connect to the servers via Bastion.**
Kindly let us know if the above helps or you need further assistance on this issue.**
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