tonysupp
It can be hard to find what you're looking for.
These are comments from another thread:
im using [whatsapp] from the google play store and ive had no issues. ... it can sign in fine however you do need MTE disabled for the login process or it just crashes, you can re-enable MTE after
How to install via Obtainium:
I now use Obtainium (with this catalog: https://apps.obtainium.imranr.dev/). Just type “WhatsApp” in the search bar; the APK is fetched directly from WhatsApp’s official website and works fine on GrapheneOS.
Official apk from Whatsapp website works OK on grapheneOS
you can't use same whatsapp account on two devices (in case you didn't know)
-https://discuss.grapheneos.org/d/26481-is-it-impossible-to-install-whatsapp-on-grapheneos