Sync error the data folder 1Password is configured to sync no longer exists
I am unable to sync 1Password for android on Samsung S9 with up to date Android OS. Tried reinstalling 1Password for Android and choosing Dropbox for the initial sync. 1Password finds my opvault correctly and it is the same one that I am using on my Windows10 devices but when I enter the password I keep getting the sync error "the data folder 1Password is configured to sync no longer exists".
Any help greatly appreciated! I have enjoyed using your product over several years and I'm not used to having any problems with it!!
1Password Version: Not Provided
Extension Version: Not Provided
OS Version: Android 8.0.0
Sync Type: Dropbox