It might be that you are trying to transfer a domain you have only recently transferred to Dynadot. If that is the case, we must abide by ICANN policy which states that newly transferred domains are locked and prevented from being transferred further for 60 days. Read more on this link: https://www.dynadot.com/community/help/question/what-is-domain-transfer-lock
We hope this didn't cause you any inconvenience.
For the quickest response, try using our Chat Support option (under "Support" in the top right corner of our website). Please try to present your problem in as much detail as possible, that way we can find a solution more quickly.