Cannot set b_channel_modify_banner

Hello together,
currently i’m trying to set up channel banners.
I noticed all my groups don’t have the permissions, but when I try to add those permissions I get
an insufficient channel modify power error, even though my group has a channel modify power of 75.
Anyone knows why I can’t tick the b_channel_modify_banner permissions?

You can tick b_channel_modify_banner only if you have enough i_group_modify_power. Have you checked that yet?

Yeah its also 75.