@TeamYouTube after waiting for one day I purchased a second time, mistakingly thinking that my first purchase was not processed. again the membership is not showing up. afterwards I checked my bank account and both purchase attempts were debit.
@TeamYouTube The billing is not unexpected. I signed for a 3-month membership and the debit is equal to the membership. After completing the purchase the the account did not show the premium membership.
@TeamYouTube The membership itself is not recognized in the account. Therefore all devices show basic membership. But my bank account got two debits for a 3-month membership.