Hi @Kazi Ariful Haq ,
Welcome to Microsoft Q&A!
Could you please use the sys.dm_database_encryption_keys dynamic management view to find the state of database encryption. In TDE, all files and filegroups in a database are encrypted. If any filegroup in a database is marked READ ONLY, the database encryption operation fails, please get more information from this link.
Best regards,
Carrin
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