I'm using the mcp builder at mcp.zoho.com and selected Zoho Sign. I have created it 4 different times but my other mcp servers are working. However, mcp for zoho sign WILL NOT WORK. It throws a 400 error. I've checked everything. I tried with both Grok and Claude. No go. My other mcp servers work just fine.

I enabled mcp access in the settings at Zoho Sign. 

You can see i connected to zoho sign as well: