Using I cloud on gmail
When I try and sign my iCloud into my gmail it says visit Apple ID and create an app password you can use with gmail
iPhone XS
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Are you using an app other than Apple Mail to access your iCloud account? If so, you need an app specific password.
You need to enable 2 Factor Authentication on your Apple ID and create an app specific password to use. If your account won’t allow 2 Factor Authentication, try 2 step verification.
Apple ID -Two-factor authentication
Two Factor Authentification availability
Apple ID - Using app-specific passwords
Apple ID - Two Step Verification App Specific Passwords