AdminDirectory List Groups being filtered via domain

[jessie....@promisepay.com]

We are doing something like this:

admin_directory = Google::Apis::AdminDirectoryV1::DirectoryService.new

admin_directory.authorization = authorization

admin_directory.authorization.fetch_access_token!

results = admin_directory.list_groups(domain: email_domain, user_key: email)

We have 2 sets of domain:

assemblypayments.com

promisepay.com

We also have Google groups that are created using @promisepay.com domain.

Previously if I do:

results = admin_directory.list_groups(domain: 'assemblypayments.com', user_key: 'test@assemblypayments')

It was able to retrieve the Google Groups that are associated with the @promisepay.com domain. 

This was no longer working as of today. However if I create a new Google group using the @assemblypayments.com domain and te...@assemblypayments.com, it works.

Was there a change on the AdminDirectory API? I'm guessing that the domain filter wasn't working correctly previously, and now it is working?