#BuiltWithEinstein Quest

I am unable to create a signup organization using this link and received the following error. Please help.

Link:

5-day trial org with Einstein Generative AI.

Error: 

We hit a snag.

"ExactTarget.OMM.FunctionExecutionException: An error occurred when attempting to evaluate a HttpPost function call. See inner exception for details.\r\n Error Code: OMM_FUNC_EXEC_ERROR\r\n - from Jint --> \r\n\r\n --- inner exception 1---\r\n\r\nSystem.Net.WebException: The remote server returned an error: (400) Bad Request. - from System\r\n\r\n\r\n\r\n"

"An error occurred when attempting to evaluate a HttpPost function call. See inner exception for details."