This issue can sometimes happen when a Last Mile or Private Last Mile script is associated with a test type but not immediately made into a test. Because the script is no longer "Unassigned" according to the Dynatrace Recorder, it will not appear in the standard Add/Edit drop-down field.
To find the missing script:
- Log into the Dynatrace Classic Portal, and select the Admin tab.
- Select either Add/Edit Last Mile Tests or Add/Edit Private Last Mile Tests as appropriate.
- At the new screen, select the link at the upper left called Create a new [Private] Last Mile Batch Order using existing tests.
- Select the appropriate agent from the top drop-down menu next to the Name text-field (IE Agent or Firefox Agent, per the script); when the screen refreshes, you will see the missing script appear to be selected.
If you do not want to add the script as a Batch Order, contact Customer Support. They can remove the script from your account, and re-send you the file to upload under a new name to start over.