Hey spuluka,
I did that but I finnaly found the solution to my problem.
I had to enable routing instance access and had to define my routing instances in my snmp communities.
community public { authorization read-write; clients { 192.168.1.71/32; } routing-instance TRUST-VRF { clients { 192.168.1.71/32; } } } routing-instance-access;
On the client side you define your comunity as TRUST-VRF@public and then it works