Hi Atif,You should configure separate ISC and keepalive link. Keepalive packets are transmitted in order for the DT pair to detect if there is a link failure (ISC failure) or if the remote peer is completely down. Here a copy-paste from the restrictions: "The peer-keepalive VLAN can have only one member port and a port cannot be a member of a regular VLAN and a peer-keepalive VLAN."
You should be able to use the already existing trunk as ISC, but you have to use another link for the keepalive.For some config examples and DT restrictions please take a look at this guide: https://higherlogicdownload.s3.amazonaws.com/HPE/MigratedAssets/Distributed%20Trunking%20-%20Configuration%20Guide.pdf
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