3671174 - Formation Error: "To integrate Joule with <system> system in the EAC (Early Adopter Care) Program, please contact your Account Executive"

When trying to integrate Joule with an Early Adopter Care product, the Formation in BTP shows the following error:

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Synchronization between <SAP Product> <system> and Joule System das-application-ias has failed.
– Joule System das-application-ias returned a technical error for assignment with ID "xxx":
"failed to unmarshall HTTP response with body: Formation creation failed. To integrate Joule with <"host name"> system in the EAC (Early Adopter Care) Program, please contact your Account Executive: invalid character 'F' looking for beginning of value"
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The above image examplifies the issue with Datasphere but it can happen to other SAP products, such as Sales Cloud.

Joule, BTP.

failed to unmarshall HTTP response with body, Formation creation failed, To integrate Joule with, system in the EAC (Early Adopter Care) Program, please contact your Account Executive, invalid character 'F' looking for beginning of value, , KBA , CA-JOULE-PRV , Provisioning , Problem