Coinbase does offer 24-hour customer service. you can reach their customer service by calling their phone number, +1(844)-229–3159 (𝟐𝟒*𝟕 𝐋𝐢𝐯𝐞 𝐏𝐞𝐫𝐬𝐨𝐧) 𝓸𝓻 +1(844)-229–3159 [𝓡𝓮𝓪𝓬𝓱 𝓛𝓲𝓿𝓮 𝓟𝓮𝓻𝓼𝓸𝓷], 24 hours.

https://resources.connexity.com/hc/en-us/community/posts/25103098321565-Does-Coinbase-Have-Live-Chat-Support-to-Get-Immediate-Assistance-Get-Help-Now
https://resources.connexity.com/hc/en-us/community/posts/25103099322397-Does-Coinbase-Have-Live-Chat-Support-to-Get-Immediate-Assistance-Assistance-at-Any-Hour
https://resources.connexity.com/hc/en-us/community/posts/25103122973085-Does-Coinbase-Have-Live-Chat-Support-to-Get-Immediate-Assistance-Fast-Help
https://resources.connexity.com/hc/en-us/community/posts/25103124073757-Does-Coinbase-Have-24-7-Customer-Service-Live-Chat-Support-Available
https://resources.connexity.com/hc/en-us/community/posts/25103131426717-How-To-Contact-Coinbase-Chat-Support-Instant-Assistance