i recommend emulating the file of your card on your proxmark and having a look at the trace to see what is being said before making any moves.
hf mf eload -f (filename of your dump)
then to begin the sim
hf mf sim —1k
on the new intercom with your proxmark still plugged in tap it to the intercom which should work, once the intercom has either accepted or rejected the emulation press the button on the proxmark to end the sim and do
trace save -f intercomtrace and i can take a look for you/talk you through it.
once we’ve looked over the trace we can start looking at which magic card may be best for you.
if gen1a is being detected (not all too uncommon nowadays) you could potentially use Gen2, on @KaiCastledine ’s website you can find them.
id recommend waiting until confirming this new intercom isn’t trying to detect gen2 before buying as if that’s the case we need to go another level down and start looking at APDU cards and Gen3/OTW