Pressure has been mounting on Myeni and it was expected her lawyers would try to block the hearing from being public.
Myeni's legal team is arguing that the compliance notice issued to her by the CIPC in November 2016 should be declared invalid because the proper process was not followed.
Her lawyer Francois van Zyl said Myeni had complied "under protest".
The bid to have the compliance notice declared invalid was launched months ago and was seen as an attempt to clean up Myeni's record ahead of Finance Minister Malusi Gigaba's decision on her one-year contract as chairwoman of the board‚ which expires in September.
However‚ reflecting the speed of political developments‚ Gigaba on Thursday told journalists that Myeni's contract would not be renewed.
Myeni was not present at the hearing.