Enketo Submission Error: “Submission service on data server not found. (404)

**1. What is the problem? Be very detailed.
Conducting a survey using Enketo linked to Aggregate.
Using our standard Enketo credentials
Enketo webforms load but when trying to submit receive the error message:
“Submission service on data server not found. (404)"

2. What app or server are you using and on what device and operating system? Include version numbers.
Aggregate 2.0.3
Enketo Api

3. What you have you tried to fix the problem?
Tried on other LSHTM hosted servers with same Enketo credentials no issue

4. What steps can we take to reproduce the problem?