SCRAM question

[MichaelDBA]

I am using pgadmin4 version 3.4 with PG 11.0 and I get this error when I 
try to connect with scram authorization:

User "myuser" does not have a valid SCRAM verifier.
How do I get around this?   And also how would I do this for psql?

Regards,
Michael Vitale