Hey @desautelsj
I played around with the request body you sent, and I noticed that the name of your field is too long. If you remove one character, the request will go through.
I will flag this and share it with our Engineering team to see if it’s expected behavior and if it is, I will submit this to our Docs team to make changes in the docs
Thanks for looking into this and for letting me about the length limitation.
Adding a note about this limitation in the docs would indeed be great but it would be even better if the API returned a more meaningful error message. Something along the lines of: You are attempting to set the name of a tracking field with a value that exceeds the 50 character limit.