Four problems below:

# dnf -y groupupdate "Core" "Minimal Install" bintray-tvheadend-stable 0.0  B/s |   0  B     00:00 Failed to synchronize cache for repo 'bintray-tvheadend-stable', ignoring this repo. Last metadata expiration check: 0:03:11 ago on Sat 16 May 2020 12:30:47 PM CDT. Error:  Problem 1: package python3-hawkey-0.35.1-9.el8_1.x86_64 requires librpm.so.8()(64bit), but none of the providers can be installed   - package python3-hawkey-0.35.1-9.el8_1.x86_64 requires librpmio.so.8()(64bit), but none of the providers can be installed   - package python3-dnf-plugins-core-4.0.8-3.el8.noarch requires python3-hawkey >= 0.34.0, but none of the providers can be installed   - cannot install both rpm-libs-4.14.2-26.el8_1.x86_64 and rpm-libs-4.11.3-43.el7.x86_64   - package dnf-plugins-core-4.0.8-3.el8.noarch requires python3-dnf-plugins-core = 4.0.8-3.el8, but none of the providers can be installed   - package deltarpm-3.6-3.el7.x86_64 requires librpm.so.3()(64bit), but none of the providers can be installed   - package deltarpm-3.6-3.el7.x86_64 requires librpmio.so.3()(64bit), but none of the providers can be installed   - conflicting requests   - problem with installed package deltarpm-3.6-3.el7.x86_64  Problem 2: package python3-rhn-client-tools-2.8.16-13.module_el8.1.0+211+ad6c0bc7.x86_64 requires libgudev, but none of the providers can be installed   - package python3-dnf-plugin-spacewalk-2.8.5-11.module_el8.1.0+211+ad6c0bc7.noarch requires python3-rhn-client-tools >= 2.8.4, but none of the providers can be installed   - package libgudev-232-4.el8.i686 obsoletes libgudev1 < 230 provided by libgudev1-219-73.el7_8.6.x86_64   - package libgudev-232-4.el8.x86_64 obsoletes libgudev1 < 230 provided by libgudev1-219-73.el7_8.6.x86_64   - package dnf-plugin-spacewalk-2.8.5-11.module_el8.1.0+211+ad6c0bc7.noarch requires python3-dnf-plugin-spacewalk = 2.8.5-11.module_el8.1.0+211+ad6c0bc7, but none of the providers can be installed   - package libgudev1-devel-219-73.el7_8.6.x86_64 requires libgudev1 = 219-73.el7_8.6, but none of the providers can be installed   - conflicting requests   - problem with installed package libgudev1-devel-219-73.el7_8.6.x86_64  Problem 3: package python3-dnf-4.2.7-7.el8_1.noarch requires dnf-data = 4.2.7-7.el8_1, but none of the providers can be installed   - package dnf-4.2.7-7.el8_1.noarch requires python3-dnf = 4.2.7-7.el8_1, but none of the providers can be installed   - cannot install both dnf-data-4.2.7-7.el8_1.noarch and dnf-data-4.0.9.2-1.el7_6.noarch   - package yum-4.2.7-7.el8_1.noarch requires dnf = 4.2.7-7.el8_1, but none of the providers can be installed   - package python2-dnf-4.0.9.2-1.el7_6.noarch requires dnf-data = 4.0.9.2-1.el7_6, but none of the providers can be installed   - conflicting requests   - problem with installed package python2-dnf-4.0.9.2-1.el7_6.noarch  Problem 4: problem with installed package ipa-client-4.6.6-11.el7.centos.x86_64   - package ipa-client-4.6.6-11.el7.centos.x86_64 requires libcollection.so.2()(64bit), but none of the providers can be installed   - package ipa-client-4.8.0-10.module_el8.1.0+255+aa2bdb39.x86_64 requires libxmlrpc_util.so.4()(64bit), but none of the providers can be installed   - cannot install both libcollection-0.7.0-39.el8.x86_64 and libcollection-0.7.0-32.el7.x86_64   - cannot install both xmlrpc-c-1.51.0-5.el8.x86_64 and xmlrpc-c-1.32.5-1905.svn2451.el7.x86_64   - package sssd-kcm-2.2.0-19.el8_1.1.x86_64 requires libcollection.so.4()(64bit), but none of the providers can be installed   - package libreport-plugin-mantisbt-2.1.11-53.el7.centos.x86_64 requires libxmlrpc_util.so.3()(64bit), but none of the providers can be installed   - conflicting requests   - problem with installed package libreport-plugin-mantisbt-2.1.11-53.el7.centos.x86_64   - package ipa-client-4.8.0-11.module_el8.1.0+253+3b90c921.x86_64 is excluded   - package ipa-client-4.8.0-13.module_el8.1.0+265+e1e65be4.x86_64 is excluded (try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages)

Ideas? -Frank