SAP Destination Service , Get Destination ending in error

We have configured the sap cloud connector to access on premise systems non sap, destination configured in Sap CLoud Platform, check successfull. But when I try to call within the microflow ‘Get Destination Service’ , it ends up in error. Does the destination which are condigured in SCP have to be binded also through ‘service bindigs options in scp’? in order for mendix to access the destinations.   Or then the XSUAA connector is a must to configure, because now we are using SAML authentication method to authenticate the users.   thanks a lot for help.  
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