You can receive 2x Astral Acclaim once if you haven’t bought the new expansion yet.
Process:
1.) Finish dailies
2.) Log out
3.) Add expac to account
4.) Login
5.) Repeat dailies for more Astral Acclaim
It won’t give you more AP and it only works once, so not anything too useful - but wanted to share.
Indeed you would miss out - I only found out because I waited a bit to buy the expac.
It unfortunately does not work for weeklies.