Hi @Tracey1983 It is not actually possible to install whatsapp directly, users need to sync and pair with their device and activate the WhatsApp notifications. At present it is not possible to access all the Whatsapp functions via the watch.
See some more information here: https://www.myhowtoonline.com/how-to-install-whatsapp-on-a-samsung-galaxy-watch/
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 4.0,Android 12 Official Version.