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Datomic currently does not support AWS SSO out-of-the-box
This issue is probably because it uses an old version of dynamodb SDK
I believe that this issue can be fixed by upgrading the AWS SDK to v2
Here a workaround:
https://gist.github.com/souenzzo/42060567479ab2dd916769f1d73042fa
@Enzzo We just released an update to run on AWS SDK v2. Please let me know if this resolves your issues using SSO.
https://docs.datomic.com/changes/pro.html#1.0.7556