Hello Pratyush,
Have Enpass 6.5.2 on iMac 23017 (Big Sur) and MacBook Pro 2012 (Catalina-latest). The iMac setup works fine, but whenever I tried to open Enpass on the laptop, it reported incorrect Master. I tried to download app from Apple Store to attempt again- no luck. I use iCloud on both (Documents folder in cloud on laptop only). Master contains characters _, !, *.