Update: I think my issue may be because of the two week waiting period Apple enforces for new Enterprise accounts that I am subject to before creating an in-house distribution provisioning profile (see screenshot).
Also, if I create the certificate myself, it appears I may need to use a complex password (per Enterprise Build failed. - #12 by dfconroy).
Here’s another resource I came across for directions for creating the push notification certificate and mobileprovision file, if necessary: EXPO - ‘exp fetch:ios:certs’ && 'exp: build:ios' - Stack Overflow.
