Hi @Whittle, Jonathan,
Your problem has more to do with Project Online and Power Automate. Unfortunately, these products are currently not supported in the Q&A forum.
I suggest you go Microsoft Power Automate Support, there are self-help documents and forums here, I hope they can be helpful to you.
For your reference:
https://learn.microsoft.com/en-us/connectors/projectonline/
https://techcommunity.microsoft.com/t5/project/ct-p/Project
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