Cannot synchronize to Server

Dear SS Team,

We have a problem with our server https://vuvnsdp.mysurvey.solutions. Our interviewers are not able to synchronize completed questionnaires to the server. We have this error message from one of the Supervisors as well (see below)

Grateful for your assistance.

Kind Regards,
toga

Toga, what version of Android OS is installed on the tablet?

Hi Sergiy,

I will get back to you on this as the survey is conducted in Vanuatu and awaiting the response from them.

Kind regards,
toga