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Currently, PowerSchool Designated Support Contacts(DSC) have access to the case portal within the Community to create a case with the Support team. I strongly suggest reaching out to the PowerSchool Designated Support Contact within your district, to add that role to your PowerSchool account. They can help you to connect with the Support Team and follow up with the sync process for further assistance.
You can also email the PowerSchool Team at email@example.com to work with the Designated Support Contacts within your district to request the role is added to your PowerSchool account on your behalf.