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It acts like it wants to update, but it won't finish. Reboots and then says it's available to update to beta 3 again. Any suggestions?

I have a 2012 Mac mini, 2017 IMac, latest iPad Pro and iPhone 11 Max. I noticed my bookmarks were no longer syncing across my devices. Well I should say they are not syncing with the Mac mini. I backed up my bookmarks, turned off syncing on each device and then deleted the bookmarks on all of the devices. On the iMac, I put my bookmarks back on this device. One by one, I turned on Safari in iCloud on each other device. All of the devices readied the bookmarks except for the Mac Mini. I have all of the updates installed and running Catalina. Any suggestions on what else I can try?