Primary account email required for sign-in error
From the subject line - I keep getting this error when trying to use Firefox Sync on my Windows 10 desktop. Sync already works on Mac and Android, and I've already verified that I'm using my primary email to login.
Solution choisie
I managed to get Sync to work by opening a Private Browsing window and signing in using the same email and password.
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Did you previously used this profile with that old primary email address ?
Solution choisie
I managed to get Sync to work by opening a Private Browsing window and signing in using the same email and password.