I tried using the Vtiger CRM module, and the account connection procedure went smoothly, but everything I try to do returns an ‘Internal Server Error 500.’ When it manages to get the entities of the CRM (leads, companies, products, etc.), anything else simply does not work.
Hello,
Looking at screenshots, error response appears to be from Vtiger CRM directly and looks like their servers maybe overloaded or down.
Are you able to reach their APIs from Postman or any other testing tool?