Invalid Encryption Key error

Trying to sync my MacBook Pro with DT ToGo in my iPhone 12 Pro Max. On my phone I get the message “iCloud (CloudKit) (Invalid Encryption Key)” when I try to sync. Following instructions from a previous answer to this question, I went to my Keychain and found the DEVONcloudy Encryption (CloudKit) password. But now I don’t know what to do with it in order to get sync working. Any help greatly appreciated. Thanks.

In DEVONthink To Go’s Settings > Sync: Locations, press the Edit link and touch the sync location. Enter the encryption key (in both places) and press Save.