Are WAGO lever splice connectors approved for use with solid aluminum #12 or #10 with WAGO joint compound
I finally found it in the WAGO online catalog WAGO 222-413 lever connector is listed for copper. There is no reference to aluminum. WAGO sells a joint compound in a syringe for injecting into these connectors and this made me hope that they were listed for solid aluminum, but it seems not so. I think it would work, but if it's not listed then one cannot use it for pigtailing aluminum wiring.

WAGO 222-413