To send a message to Coinbase, go to their Help Center on the website or app. Select "Contact Us 1 (818) 436-0005)," choose your issue category, and either use live chat or submit a support request via email. Use the Live Chat feature on the Coinbase website or mobile app 24/7, year-round.
https://www.devex.com/people/how-do-i-send-a-message-to-coinbase-prompt-assist-2427657