How did you allow gmail to be used to send emails? In your gmail account? I have not noticed such settings. Could you show a screenshot of these settings?

@alex7070
It was years ago

Go to https://security.google.com/settings/security/apppasswords and sign in to your account.
Select Mail from the list of apps available.
Select Other from the device list.
Enter your Custom Name. ...
Click the Generate button.
Copy and save the password to your computer.
Click the Done button, and that's it.

https://support.google.com/a/answer/176600?hl=en
https://support.google.com/accounts/answer/185833?hl=en
https://www.jotform.com/help/392-how-to-use-your-gmail-account-as-your-email-sender-via-smtp

I just tried it and got a message: This setting is not available for your account

Do you have a special gmail account?