Portal , queryRecordType queryFilter

Certified Senior Developer

I want to use a queryRecordType in a portal interface and obtain the data, but I need to filter the data so as not to recover everything. What should I do to be able to filter the data since it does not allow me to use a queryFilter in the portla interface? I get this message: "Service Account", I have the Service Account user configured as administrator in the record in case it could be due to permissions

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