Hey @davidmatacr! It looks like you were able to chat with our support team regarding this issue. Feel free to follow-up via that thread if you’re still experiencing issues.
I am going to post some of the troubleshooting tips here from my colleagues Nikki and Edcel for anyone following along that is running into similar challenges.
It looks like we might be dealing with some Trainerize permissions issues here. The error message that we're getting back in our logs indicates that the Trainerize account connected in the Zap does not have "Manage Client" permissions.
When connecting to Zapier, you will not see the permissions configured in the Trainerize account. This needs to be checked manually from your account settings within your Trainerize account.
It's possible the account connected in the Zap only has "Read" access for instances instead of "Write" access, and the larger "Write" permissions would be needed here. There's more on Trainerize permissions here: https://help.trainerize.com/hc/en-us/articles/360000695586-Trainer-Manager-and-Staff-Permissions
If the account connected is only a "Trainer" for instance, they can add new clients for themselves only, as an example.
We recommend signing into the Trainerize account with the highest permissions, or double-checking that the account connected also the highest permissions.