Invoices not posting to AR

I recently entered several invoices in Quick Bill.  They have all been printed from billing and appear to have posted normally with no error messages on the posting reports.  I have posted all my other modules ie EQ, JC, PR, GL etc as well.   

Now I'm trying to enter some AR receipts under Enter Cash Receipts and none of these invoices are showing up in the dropdown menu.   They do not show up in adjust receivables either.    

I have not yet closed out 2020 yet because I'm still waiting for closing entries from the accountant.  I tried opening up more periods in GL but that did not remedy my issue.  

Does anyone have any idea where the problem might be and how to get them posted so I can enter the payments received? 

Thanks,

Marilyn Edlund