For some reason, the grant leaves button is not showing in the leave period. I thought it could be permission issue, so I logged in as administrator but still same issue:
Grant leaves button missing
@tefobw If you are using v13 then Grant button will be in Leave Policy Assignment form. Use awesome bar to search if you do not find Leave Policy Assignment in the dash board cards.
Thank you, didn’t realise it had moved
You are welcome. 
But please let me know if Grant button works with earned leaves (monthly allocated) in your case. It is not working for me and still trying to figure out why.