I raised a complaint about access key issues 1 half month before, but still have not been resolved, I am disappointed. whenever I get a reply from your side that still working on the issues.
First of all, Please accept our sincere apologies, We are aware of the issue We will enable iam keys soon.
Until then we resolve to enable IAM Keys, I would like to suggest a workaround for you to use terraform on your local machine with AWS.
Please have a look at the following playground as well, https://kodekloud.com/topic/playground-terraform/ it makes use of terraform with AWS using Localstack,
FYI: LocalStack - A fully functional local cloud stack, Develop and test your cloud and serverless apps offline! Please let me know if this helps.