Autogenerate Identifiers link for groups fails

Clicking on the link Autogenerate Identifiers for a CO Group fails and logs a stack trace.

For example clicking the link results in a GET to this URL

https://registry-dev.lsst.codes/registry/identifiers/assign/cogroupid:8

and the logged stack trace

2021-02-10 11:17:54 Error: [InvalidArgumentException] No CO Specified
Request URL: /registry/identifiers/assign/cogroupid:8
Stack Trace:
#0 /srv/comanage-registry/app/Controller/StandardController.php(224): AppController->beforeFilter()
#1 /srv/comanage-registry/app/Controller/MVPAController.php(65): StandardController->beforeFilter()
#2 /srv/comanage-registry/app/Controller/IdentifiersController.php(206): MVPAController->beforeFilter()
#3 /srv/comanage-registry/lib/Cake/Event/CakeEventManager.php(244): IdentifiersController->beforeFilter(Object(CakeEvent))
#4 /srv/comanage-registry/lib/Cake/Controller/Controller.php(682): CakeEventManager->dispatch(Object(CakeEvent))
#5 /srv/comanage-registry/lib/Cake/Routing/Dispatcher.php(189): Controller->startupProcess()
#6 /srv/comanage-registry/lib/Cake/Routing/Dispatcher.php(167): Dispatcher->_invoke(Object(IdentifiersController), Object(CakeRequest))
#7 /srv/comanage-registry/app/webroot/index.php(96): Dispatcher->dispatch(Object(CakeRequest), Object(CakeResponse))
#8 {main}