Ultra Instinct is sometimes refered as a transformation and sometimes as a technique/state. Now apparently there are thousands of fans who believes Ultra Instinct can be used on top of another transformation, just like kaioken can be used on top of Super Saiyan Blue and make Super Saiyan Blue kaioken, they believe you can have a Super Saiyan Blue Ultra Instinct or a Super Saiyan God Ultra Instinct.
Personally I dont believe this is possible, but there are thousands who thinks so and this situation already has consequences in the Dragon Ball fandom, for example there is a videogame mod of Dragon Ball Xenoverse which allows you to use "Goku Ultra Instinct Super Saiyan Blue Kaioken"
and there are also fan arts made about it like this one,
Are all these people just wrong or is there any hint/explanation in Dragon Ball Super that states this is possible?