There was an error in Internet Accounts preference pane

Can’t add an exchange account to Mac Mail | Apple Support Communities. Jose has the solution. What a unique way and workaround for this issue.

I had the same problem, this is what I did.

I added the account, but for the password I put a bogus password.

I clicked to continue when it gave me the password error.

I put my full email address, correct password, and the server was
Then it took the account.
Let me know if that helped.

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