No, you usually can’t just buy a replacement dongle for Microsoft / Surface ergonomic keyboards.
Either:
If it's under the warranty, then contact Microsoft for replacement under support.
Or upgrade to a Bluetooth or Logitech-style ecosystem.
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The dongle to my ergonomic keyboard has been lost. Can I get a replacement?
No, you usually can’t just buy a replacement dongle for Microsoft / Surface ergonomic keyboards.
Either:
If it's under the warranty, then contact Microsoft for replacement under support.
Or upgrade to a Bluetooth or Logitech-style ecosystem.