How do I add multiple Google accounts to Apple Mail on my iMac?
I just got a refurbished 2017 iMac with Catalina 10.15.7. I have three Google email accounts. I can access my main account on Apple Mail but not the others. I have tried going through "Accounts" but Google just says "this account already exists". I can only access my two other accounts by separately logging into Google Mail.
Old Apple Mail 10.3:
New Apple Mail 13.4:
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iMac 21.5″, macOS 10.12