PowerAutomate JSON Failure

Hello, wondering if anybody else has ran into this issue. 

We run a Power Automate flow to change the Requestor field (in Zendesk) to the user that submits a Sharepoint form. Without it, the ticket would have the Requestor as No Reply-Sharepoint  

It worked for a while, but we are now getting a "The response is not in a JSON format." error. The detailed error message says the Request Header is too long.
 
Microsoft's trigger is sending the request with a specific header value, I think Set-Cookie, and I'm wondering if it is too long for Zendesk.

Any thoughts?