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TBF if single sign on is implemented correctly and you use the same email address across your accounts then it shouldn't matter which SSO you're using.

When you log in for the first time it should request permission to "see your email address". Then you authenticate with your provider and get redirected back at which point the website should create an account for you on behalf of that email address. If next time you log in again via a complete different provider which has the same email address then it should just work. I mean that is the whole point of this...

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