Smart 1:1s schedule around you and your attendee's mutual availability, timezone, and meeting hours. You can read more about how Smart 1:1s are scheduled in this article. If you're finding that a Smart 1:1 isn't scheduling, or if you're seeing an error on your Smart 1:1 page, the most common culprit is limited availability.
If the organizer and attendee have limited overlapping hours, Reclaim will provide a Few overlapping hours warning along with details on what hours area available for scheduling.
You can view their hours in your timezone by clicking the timezone label in "their hours (et)"
How to fix it
The key to fixing this issue is to expand your availability. There are two primary ways to do this:
Contact your attendee and ask them to expand their meeting hours in Reclaim.
Ensure that your calendar(s) have sufficient free time to schedule the meeting.
If you're using custom meeting times, make sure both the organizer and attendee have overlapping hours.