Using Convert Time Format

Any thoughts on where I'm going wrong trying to subtract 30 minutes from this timestamp using Functions > Convert Time Format ? The input is 2021-09-10T19:00:06.951Z and the broken output is %Y-%32-%5T%18:%9:%9.%f+0000 . I'd like to return 2021-09-10T18:30:06.951Z . I suspect it has something to do with my time format being off ( %Y-%m-%dT%H:%M:%S.%fZ )

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