Hello ArtKamaaina,
Thank you for posting in the Apple Support Communities. We're here to provide you with support.
We suggest following the steps below to be sure your devices are fully updated, and your Internet connection and account details have no issues. These general steps might help reestablish the connection between your devices and get iCloud Tabs to sync correctly again. These steps and more can be found in this resource:
If your iCloud or Safari bookmarks aren’t syncing
Additional steps can be found in the section "If you can't set up or use iCloud Tabs" here:
Set up and use iCloud Tabs
If this concern isn't resolved after taking the steps above, we recommend that you contact Apple Support directly. Depending on your region, you may be able to reach them here:
Get Support
We hope this information is useful. Kind regards.