Unable to backup WhatsApp chats to iCloud
I want to backup my WhatsApp chats to iCloud on my old iPhone 14 Pro Max, so I can restore them to my new 16 Pro Max. I get the message: Backup not complete. Not signed in to iCloud. However I am definitely signed in to iCloud and WhatsApp is enabled in iCloud. Why is it not backing up?
iPhone 14 Pro Max, iOS 18