Unless explicitly stated on the documentation for a method, the accepted Web API call content types are:
Calls using any other content type (ex: text/plain) are not supported.
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APIs
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TeamDynamix.Api.Feed.ItemUpdate
TeamDynamix.Api.Feed.ItemUpdate.LastUpdatedDate
The last-modified date of the feed entry.
Remarks
Replying to the feed entry updates this value.
Feeds are frequently shown chronologically based on this value.