VNX 7500 - expanding a LUN has not worked

I have tried to expand a LUN (concat) with another 50GB.

The wizard said it had completed successfully.

But, the original size still shows - 3450GB

When I go thru the wizard again, it says Current user capacity 3450GB, but Max 3500GB as though it has worked but is somehow stuck.

Any ideas on a fix?

reboot SPA/SPB?

Its not easy to get the logs off as its a secure client