Reserve Fixtures Help Please!

I am just starting my 4th season at the mighty Wrexham and for some reason I am never getting given reserve team fixtures. I'm 100% sure I am clicking the accept button to the invitation to join the reserve league and my under 18's are getting their fixtures with no problems.

I have thought it might be beacuse I have not got enough players in the reserve squad, but I have never had this problem in previous games.

Does anyone have any idea what might be causing this?

Thanks in advance.