Yellow Box Zigbee

I have the Yellow Box and currently do not use Zigbee. I noticed this morning that the Zigbee integration showed as disconnected. I tried ‘reload’ but that did not resolve the issue.
Then I deleted the integration but now fail to re-install using ‘Zigbee Home Automation’ and selecting the ‘Yellow Zigbee Module’. What it the correct way to re-install Zigbee on Yellow Box ?

RESOLVED. I restarted the Silicon Labs Multiprotocol Add-on and Zigbee came back.