Hi @Olive
I do not know why he was issued with a second Duldung if the first one was still valid. Normally the authorities should have written his new address on the Duldung he already had but the procedure may differ throughout Germany.
As far as I know, it would be quite unusual to receive the residence permit 25,5 after just 7 months in the country. It is generally only given after a person has had a Duldung for 18 months.
I do not understand what you mean by approval from BAMF. Your boyfriend has asked for and received a Duldung for family reasons from the foreigners’ office. I am not aware what role BAMF would play in this procedure.
Best,
Éanna