Trouble syncing to iphone from mac

i am not able to sync my decks from my mac to my iphone. I have done the latest updates but still can’t sync. here is the message i get.Can anyone help?

thank you

Screen Shot 2020-08-22 at 6.12.48 PM

If you use a third-party antivirus or network filter, perhaps turning it off will help. If you don’t use any such programs, please try syncing on a different network.

that didn’t seem to change anything. Also, I should note that i had synced in the passed with no problem

Some Googling indicates it may be a keychain issue, and rebooting your Mac may help.