FATAL: password authentication failed for user "Postgres" when connecting to Postgre with PGAdmin

[Sonja_Bauernfeind]

Qlik Sense and Qlik NPrinting use PosgreSQL as their repositories, which you can connect to using PGAdmin. See Installing and Configuring PGAdmin 4 to access the PostgreSQL database used by Qlik Sense or NPrinti....

If the connection fails with:

FATAL: password authentication failed for user "Postgres" 

Then verify that the username is written correctly and the password is correct.

In this case, Postgres is incorrect, as username and password are case-sensitive. The default user will always be postgres, all lowercase.

Environment

Qlik Sense Enterprise on Windows 
Qlik NPrinting