Hey, this is funny. I had big troubles with my apple ID after updating on BigSur. My Mac, iPhone, Watch, are signed in to the same Apple ID, but all devices showed: the service could not be activated because you are not signed to the same Apple ID. I need to sign out from iCloud on all devices and sign in again. It helps. But the Safari is ugly. The only help for me is to migrate to Chrome for a while.
Castic
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