Salesforce sandbox integration

I am not able to integrate with a Salesforce sandbox. It has worked before very briefly, but never for more than a day. When I log in to the sandbox, everything looks successful in Salesforce, including a successful login logged; however in Monday, it shows “Integration Error General”. support have been investigating for over a week but have not been able to fix it.

Does anyone have any experience integrating with a Salesforce sandbox? Is it even possible?

Thank you

Hi Brian!

It seems that the issue was related due to a URL discrepancy. Our developers have been informed of the solution you found to see if we can improve this experience for other users.