Some users are getting an "incorrect function" error when trying to save files (e.g. Word)

[dspp]

Sometimes the error shows in a box the path to the shared folder then "Incorrect function." These Windows 10 (21H2) users are domain users saving files to their domain accounts on a 2016 Windows Server. Last week we did install the cumulative update KB5021235 on that server. I tried disabling Cortana and running SFC on computers that have had this error, but the errors sometimes come back. It doesn't seem to be consistent.

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