Group membership approval not working for DL

HI team,

We have separate user domain and resource domain. Exchange is in resource domain for which users master accounts is in user domain. so linked mailboxes in resource domain.

Few Distribution list in resource domain's exchange has owners defined and membership addition / deletion should happen through approval from owner for that DL. 

In Resource domain all users are in disabled state as their mater accounts are in user domain. hence all DL contains members and owner are also from resource domain so are disabled.

now when approval request going to owner of that group, he is not able to approve the request. seems like approver is using user domain account to approve the same as he cant use resource domain account as that is disabled.

error is coming as unauthorized operation.

Please help to fix the issue.

Thanks 

Anees