Hi Brian,
Thank you for contacting Syncfusion Support.
We suggest you to check the following items while entering query in SOQL Query property,
- Replace space in between your SOQL query with + sign (so concatenate all your SOQL query with + sign)
- Remove unwanted spaces before or after the SOQL query.
These are the possibilities for “400 unknown version” error.
If error persists, share your sample SOQL query. It will be helpful for us to check from our side and provide solution.
Please let us know, if you need further assistance.
Regards,
Nijandan D