Garmin Express does not recognize my Nüvi 2460's sd-card

I have just tried to update to the new CN NTU 2022.10, but Garmin Express keeps telling me to insert a memory card although there is an 8 GB memory card in my Nüvi 2460. I also have tried an empty 16 GB SD for testing purposes, but it is not recognized either. Both SD cards are FAT32 formatted. What's going on, Garmin?