I did this with my 2024 KR to see if I could...and I wanted 3 FOBs.
I ran into issues because the FOB seller sold me a 19-21 style FOB labeled as a 2024 FOB. It worked...but didn't work 100% The earlier FOBS will start the vehicle, but the buttons will not work. Ensure you have a 2024 compatible FOB. Ford has made so many changes within the 17-24 body style, that they aren't compatible with each other within the generation. It took us a week of fiddling with FOB's before finding out the real issue.
Just a FYI. FORSCAN worked great otherwise to program the FOB using the FORSCAN forum programming instructions.