SQL Server Login

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Individuals with acccess to our 3-party software have been encountering
the following error messages:

Connection failed:
SQLState: '28000'
SQL Server Error: 18456
[Microsoft][ODBC SQL Server Drive ][SQL Sever}Login failed for
user'xxxxxxx x'

User's have been using the default login id and p/w which it would
allow them to get in; but the problem have elevated to where it does
not allow all users to use the default login id and p/w and users
personal login id and p/w.

Please advice.

Thank you

.