The supported mono arches for EPEL7 has been updated and it now supports more arches than before. Because of that, not only can this package not be installed on the new arches, it is blocking the building of other packages that depend on it.
dbus-sharp-0.7.0-16.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-25b9a6a945
dbus-sharp-0.7.0-16.el7 has been pushed to the Fedora EPEL 7 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-25b9a6a945
dbus-sharp-0.7.0-16.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.