Can't login to Sync app

For the past week, I was receiving error messages in the Sync app that I was not logged in to lemmy.sdf.org, even though it appeared that I was. I got tired of the error messages in Sync, so I logged out. Now when I try to log back in to lemmy.sdf.org in the Sync app, I get an error message. I know it's not a password issue, since I logged out and logged back in to lemmy.sdf.org via a browser with the same password. Not sure if this is a Sync issue or a lemmy.sdf.org issue. Anyone know what's going on and have a fix? Thank you.