Mailbox Warming Completed, but Facing Block: What Next?

heyy! waited nearly two weeks for the inbox warm up to happen and got an email saying it was complete however when i logged in to Clay this morning it's got a warning message... Mailbox warming is blocked: Multiple retries were made. All bounced. what are the next steps? contacted the chat box but nothing back so far 😞 deleted.. for Smartlead not clay!! 😞