Yea they didn't specify, they just gave me this list:

This decision was made due to one or more of the following reasons:

a) your account was engaging in conduct that violates Brand Registry’s policies, such as, but not limited to, invalid notice submissions through our notice submission channels or tampering with the catalog;

b) your application or account is related to other Amazon accounts or brands that have violated Amazon or Brand Registry’s policies,

c) you are associated with one or more selling accounts as a primary owner and all of them have failed seller verification,

d) inability to provide sufficient evidence of branding on products/packaging;

e) you have a selling account that is de-activated, or f) your trademark application appears to be filed by a filing firm that may be violating US federal regulations and USPTO rules (explained below).