We have had clients raise questions regarding aliasing where they are seeing known users being aliased to other known profiles.
Aliasing between known profiles are often unexpected for our users as they only expect aliasing to occur from an unknown to a known profile. However, our product is working as designed. mParticle does not have an explicit blocking of source known profile to destination known profile aliasing just because the source profile is known.
Aliasing of a source known profile to a destination known profile can be done.
To learn more, please visit our docs.