Forgot to come and answer myself, so:
I contacted Transifex directly and it turns out my Transifex account was created via a social media account. In order to make any account changes I would need to either log in via the same social media account, or re-register with the same email address.
Sam from the Transifex team here. Unfortunately, the search function doesn't support operators at the moment. You'll need to search for strings individually and then share the permalink of each search result with your community.