How can I solve Postgresql SCRAM authentifcation problem?

Your application uses an API that is linked with the PostgreSQL client C library libpq.

The version of that library must be 9.6 or older, and SCRAM authentication was introduced in v10.

Upgrade libpq on the application end and try again.

If you don't need scram-sha-256 authentication, you can revert to md5:

• set password_encryption = md5 in postgresql.conf
• change the authentication method to md5 in pg_hba_conf
• reload PostgreSQL
• change the password of the user to get an MD5 encrypted password

Encountered the same issue and applied @Laurenz Albe's fix but I would get an authentication error on my user for the database, because of encryption strategy change.

So instead of replacing scram-sha-256 with md5, replace it with trust in pg_hba.conf