Assigning Archive folder to Shared Mailbox doesn't work.

I have a shared mailbox which has exceeded 25 gb limit and now I want to move those emails to archive folder. I have assigned a licence to the shared mailbox. Now the problem is that the archive folder is visible in owa but the email are not moving to archive folder. I have removed the retention policy and reapplied it twice and have waited for 24 hours but still not able to move emails to archive folder in sharedmailbox.