Option to remove host from cluster greyed out with message "This functionality is not allowed at the moment. Please check back later."
Found in VCF 5.2 and older 5.x versions
This is a known issue which will be fixed in future versions of SDDC Manager.
Navigate to the Cluster view, wait for the Summary tab to load and then visit the Hosts tab.
Note: Refreshing the page will retrigger the issue