I did a few tests and checked that the panel does not need to have that Control Page enabled to be added to your panel to be able to control it from there.
First think I would try is updating your panel to 4.5.2. You current version should work but possibly updating to the latest version may fix something that didn’t happen.
Instructions to update are located below
If this doesn’t fix the issue, could you try deleting your Lutron account from Alarm.com and learning it back in and waiting about 15 min to see if it adds it.