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Currently it is not possible to set a corresponding policy.
However, administrators can enable approvers to set or change an expiration date by allowing them to change order details.
Please refer to the Administrator Guide on page 443 for details.
Would it be possible to create a powershell script that gets called when users request access to certain groups that then marks that group membership as temporary?
there is currently no way to execute a script after group membership assignment. It would be possible if you would use an Opentemplate for the request, those allow a script execution to be attached in which you could check if a date has been selected and if not set the default expiration. The relevant controls for this case would be "GroupAccountSearchTextField" and "DatePicker".