Acumbamail Piece Dateformat broken?

Acumbamail expected date format is dd/mm/yyyy hh:mm:ss - but if I use this (modified by the "date/time format piece outside the branch) → I always get a 400 error

Maybe this is in relation with this → Date/Time in branch piece not working correctly - #4 by Bram

or is this issue more related to the Acumbamail Piece (add row) ?

{“response”:{“status”:400,“body”:{“error”:“Error: Enter a valid date/time. \n”}},“request”:{“body”:{“_overheadLength”:2095,“_valueLength”:125,“_valuesToMeasure”:,“writable”:false,“readable”:true,“dataSize”:0,“maxDataSize”:2097152,“pauseStreams”:true,“_released”:true,“_streams”:,“_currentStream”:null,“_insideLoop”:false,“_pendingNext”:false,“_boundary”:“--------------------------534612395335979187093238”,“_events”:{},“_eventsCount”:3}}}

can you help me… ?