Could you attach a screenshot of your flow?
It seems that OneDrive for Business trigger “When a file is created” doesn’t work as expected on your side.
Does the error 400 occur on the trigger or on the following action?
Could you please try to recreate the connection and try again?
I have made a simple test with the trigger When a file is created, it is working fine.
I am interested how this issue was resolved as I am experiencing the same error. I have a OneDrive for Business event "When A File is Created" and then an HTTP request:
You may be trying to use the path instead of the ID when your getting that error.
Trigger your flow the same way, by file creation, but than read the directory's contents in a separate action after finding the files by path with a pattern.
You will get all the files now in that folder and loop through them instead of triggering them 1 at a time.
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