The CHECK_POLICY and CHECK_EXPIRATION options cannot be turned OFF when MUST_CHANGE is ON.
1. In the below step I am giving the same password, to fix “User Must Change Password” flag.
USE Master
GO
ALTER LOGIN [Login Name]
WITH PASSWORD = ‘Same
Password‘
GO
2. Turnoff the passowrd policy
ALTER LOGIN [Login Name]
WITH
CHECK_POLICY = OFF,
CHECK_EXPIRATION =
OFF;