Rename calendar / update summary

[TOB]

Hello world,

we have a bunch of users we need to rename the primary calendars for. Now I wrote a script for that using GAM and I just thought you might can help me out.

Executing:

gam user us...@example.com update calendar us...@example.com summary NewCalendarName

When I run

gam user us...@example.com show calendars

I am able to see the summary / title of the primary calendar changed to the new one. If I take a look on calendar.google.com it's still the old name, even when I unsubscribe and subscribe it again.

Do you know what to do to change the 'display name' on Google's calendar page as well via GAM? Am I thinking the wrong way?

Thank you for any input, I really appreciate it! :)