Problem:
Can I add users with different domains in the same Signals Notebook tenant?
Solution:
Yes you can add and give access to multiple different domain users. Signals Notebook do not have any constraints or limitations on adding multiple domain in the same tenant.
For Example: You can add all the below domains in a single tenant.
DummyUser0@gmail.com
ABCDEFG@xyz.com
ABCDEFG@abc.com
DummyUser1@axbycz.com