ALTER DEFAULT PRIVILEGES

HelloTeam

I have a question on how to revoke privileges granted by another user
\ddp shows (Swedish names)
Owner | Schema | Type | Access privileges
--------------------+------------------------+----------+-------------------------------------------
sbkrojo | kom_enhetskatalogen_v1 | table | leveransdata_r=r/sbkrojo +
| | | leveransdata_w=arwdDxt/sbkrojo +
| | | ponf_r=r/sbkrojo +
| | | tk_r=r/sbkrojo

The two last lines is the ones I whish to get rid of
I tried the following sql statement
ALTER DEFAULT PRIVILEGES IN SCHEMA kom_enhetskatalogen_v1 revoke all on tables from tk_r
but the grant is still present
Also tried to grant myown id to role sbkrojo,;
GRANT SBKROJO O MYID WITH ADMIN OPTION;
But I'm still not able to remove the privileges from tk_r.
Is there a way to achieve this ?
Sbkrojo is an old user no longer with our organization but I don't want to change the pwd for it since there are bach jobs running under the same id.
We are running
postgres (PostgreSQL) 9.5.2 on windows server 2012.
Thanks for your support

Best regards

Vänliga hälsningar

Fredrik Gustavsson

Systemadministratör
Geodataavdelningen

GÖTEBORGS STAD
Stadsbyggnadskontoret

Telefon: 031-36880801
E-post: fredrik(dot)gustavsson(at)sbk(dot)goteborg(dot)se

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