I assume that the “praktik” has been approved by the Jobcenter/A-kasse, and that you can receive dagpenge in the “praktik”-period.
So if you have met the requirements of being available for the labor-market, which you say you have – then you are eligible for dagpenge as normal.
In this case you will off course get you dagpenge for May paid out. It is AKA who should pay your dagpenge, because you have been member in AKA since 1 st May.
You must try to call AKA and ask them to contact Min A-kasse about the transfer.
Anders Weber, A-kasser.dk