Hi Jeff,
Thanks for sharing. Is it possible that you switched two packages by mistake? The FRDM-KE15Z_manifest.xml file you shared is not related to MKV31F512xxx12/FRDM-KV31F device/board, instead it contains data for MKE15Z256xxx7/FRDM_KE15Z.
Also please note that in case of existing SDK packages generated on MCUXpresso SDK web prior to March 22nd, these packages does not support MCUXpresso IDE and has to be regenerated to be able to use them in the MCUXpresso IDE.
Regards,
Lukas