Yes, you can change the email you used for an external agent when you invited them to collaborate in Deal Room. If there's a typo or you need to change it to a different email, you can generate a new invitation email using the 'Invite Buyer's Agent' button inside the relevant offer folder — even after you've already sent them one from this folder.
Note: the new invitation MUST be generated before the agent accepts access. If they've already accepted the invitation, they must update their email themselves from inside the deal room.
Below is a brief video tutorial: