  We determine the structure of 1-form symmetries for all 4d $\mathcal{N} = 2$
theories that have a geometric engineering in terms of type IIB string theory
on isolated hypersurface singularities. This is a large class of models, that
includes Argyres-Douglas theories and many others. Despite the lack of known
gauge theory descriptions for most such theories, we find that the spectrum of
1-form symmetries can be obtained via a careful analysis of the non-commutative
behaviour of RR fluxes at infinity in the IIB setup. The final result admits a
very compact field theoretical reformulation in terms of the BPS quiver. We
illustrate our methods in detail in the case of the $(\mathfrak{g},
\mathfrak{g}')$ Argyres-Douglas theories found by Cecotti-Neitzke-Vafa. In
those cases where $\mathcal{N} = 1$ gauge theory descriptions have been
proposed for theories within this class, we find agreement between the 1-form
symmetries of such $\mathcal{N} = 1$ Lagrangian flows and those of the actual
Argyres-Douglas fixed points, thus giving a consistency check for these
proposals.
