Hi, @Darshan Welcome to the Microsoft Q&A forum, and thanks for reaching out.
If my understanding is correct you are connecting to an SQL server, correct me if I am wrong since you mentioned Azure MySQL but the error message shows as SQL
If you are connecting to a SQL Server. If so, you might have to enable TLS 2.0 by installing a CU, or alternately, you might have to disable validation for TLS 2.0 in DMS.
Please let me know if you need any additional information.
Regards
Geetha