Teams Private Channel Invite Groups

Question

Hello

We use Teams in our school / university.

Teachers used groups created automatically by SDS (School Data Sync) to adapt their classes/teams as needed.

Some created a group manually. And they divided the class into channels on the same team.
But as they said, the option to add a group to a private team no longer appears (recently). Being necessary to add one by one.

You can tell if you have any option or way to correct it.

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I saw that the hide option of the GAL (Global Address List) in the SDS is now checked by default (HiddenFromAddressListsEnabled).

I changed it by powershell. But that option only corrected to go back to viewing the groups in the calendar. Many teachers use it for meeting with classes.

I thought this might be the case above. But not.

Thanks