How did you perform the restore, with plain SQL? Have you add the option WITH RECOVERY?
With option WITH NORECOVERY the database engine waits for further differential/log backups to be also restored.
If so, use option WITH RECOVERY ONLY to finish the restore process.
See https://learn.microsoft.com/en-us/sql/t-sql/statements/restore-statements-transact-sql?view=sql-server-ver15
=> Comparison of RECOVERY and NORECOVERY