First of all, i am not sure that AAS is available on the beta SailfishOS Image for Xperia 10 IV / V.
Just do as devel-su:
ssu lr
and look if the Repository aliendalvik is present. When its present - than you could install AAS.
When its not present, than you need to wait until official image for Xperia 10 IV/V is out.
You tell you bought a licence, but you couldn’t buy a licence for Xperia IV / V atm. Only for Xperia 10 III or older phones… So maybe it will be necessary to contact Zendesk for Licence transition.