This is a guest post from Daniel Partridge - who answered an internal enquiry at Microsoft, for a colleague who needed to add a task under a summary using Power Automate (Flow). Great timing as Dani...
Published Feb 03, 2020
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Blog Post
You would change the last part of the URI to point to the task you want to modify (include the guid just like the project) and remove the Add method and also change the method to Patch in stead of Post.