If I select a pre-script that requires parameters (mandatory or optional) for an update management deployment, the OK button is greyed out, and I cannot save the deployment.
I have tried adding a sample script from the gallery (e.g., "Update Management - Run Script Locally") still cannot save the deployment.
Creating a new automation account did not help. It seems to be a general issue. Here is another user with the same behaviour.
This product bug is fixed. Please try and let me know if you still face any issue.