Hi @Damaschke, Michael ,
Thank you for posting in this community.
You must be an admin for a business subscription to use these support methods. (You must have bought at least one subscription through Microsoft to access Microsoft support.)
In other words, you have to give user business subscription licenses, then they can create a support ticket. Nothing to do with the Admin role user has.
If you're not a business admin, please use this support page
Reference: Get support for Microsoft 365 for business
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