When the SD card is not installed on the device, everything will look the same as you wrote. Before releasing the SD card from the slot, you should have read a little on the forum about this topic. For example here:
https://www.mobileread.com/forums/sh...5&postcount=35
On the Tolino Vision 6, the SD card is not as easy to remove compared to the Kobo Libra 2.
Take a photo of what your slot looks like. Perhaps the SD card can simply be glued with adhesive tape. On this forum, I saw a photo of one Libra 2 owner who broke the slot and glued the SD card to the motherboard with adhesive tape.