Http Request Data being Encoded automatically when API expects Raw Data

The issue that the team I am working with is facing deals with the load testing pieces of Telerik Test Studio. We are currently attempting to build a load test regarding our login procedure; however, the login portal we are using is Microsoft's Azure B2C Login Portal and as such we must follow their standards with request parameters . For the most part we have been able to do so by adjusting the parameters we send with custom dynamic targets. The primary issue is that one of our requests requires that the parameter be sent back as a base64 encoded string, yet Telerik Test Studio is automatically encoding the equal sign at the end of the request. The parameter is being retrieved from a custom dynamic target and while the request returns a 200 response, we are still receiving a warning message from the API as well as not receiving additional data that is required for future requests. When running the request with the same parameters through Postman we are able to receive the response request with no additional warnings and with all of the response data intact. Is there a way to edit the encoding settings of Telerik Test Studio so as to allow this situation to occur naturally?