My newly purchased large meeting license is not working on already scheduled recurring meeting

Hi,

I scheduled a recurring meeting with my pro-licensed zoom account which initially has 100 participants limit. 

Now since more people need to participate, I purchased a large meeting of 500 users now and applied it to the admin user.  But still, the meeting registrations are not accepted beyond 100 saying "Registration is closed" message.

Quick response in this regard is highly appreciated.

Thanks & Regards,

Ravi