I have the same error that still occurs despite following the instructions
Versions:
WordPress: 6.5.5
WordPress MS: No
PHP: 8.0.30
WP Mail SMTP: 4.0.1
Params:
Mailer: sendinblue
Constants: No
API Key: Yes
Debug:
Źródło e-mail: WP Mail SMTP
Mailer: Brevo
unauthorized: not verified
