Homsie's emails are sent from noreply@gethomsie.com. If a client hasn't received their invite:
Ask them to search their inbox for noreply@gethomsie.com, and to add it to their contacts so future monthly value updates reach them too.
Check that the client's email address on their profile is spelled correctly — a typo is the most common cause.
To get them in right away, copy your invite link and send it to them directly. Anyone who signs up through it is still linked to you. (See "Getting your clients into Homsie.")