@HavenC Unfortunately ios has not been supported since Galaxy Watch 4 and the move to Wear OS. Some information here https://www.xda-developers.com/samsung-galaxy-watch-5-iphone-support/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .