Unable to login/sync Zotero desktop after transfer to another computer

Recently, I installed Zotero standalone app to a new system and transferred to it the whole Zotero data library (following the process as described in https://www.zotero.org/support/kb/transferring_a_library). This shares the data between around 3 systems through Google Drive. I followed this process without any problem in login or syncing before. But this time I am unable to login and sync the data. All the systems cannot login/sync anymore although I can still use Zotero and add data to my library. It shows the following message
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The Zotero sync server did not accept your username and password.

Please check that you have entered your zotero.org login information correctly in the Zotero sync preferences.

Open Sync Preferences
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Please help solve this login issue.
  • It means what it says. You have to enter your username and password in the Sync pane of the preferences. Make sure you click Set Up Syncing afterward.
    This shares the data between around 3 systems through Google Drive.
    Not sure what you mean by this, but your active Zotero data directory definitely shouldn't be in cloud storage.
  • What I meant was the Zotero data uploaded in one system can be accessed in another system later since it was shared/updated through Google Drive. Even now I can upload data in one system and access it in another (later). But now I can no longer enter my username and password from the desktop app. Syncing and login was possible before.
  • Read the two things I wrote.
  • Thank you so much for the prompt help and instructions. The login/syncing problem is solved.

    Just another query, I have additional files zotero.sqlite.1.bak and zotero.sqlite.111.bak apart from zotero.sqlite and zotero.sqlite.bak in zotero folder. Is it useful or is it safe to delete them?
  • Those are automatic backups that are maintained by Zotero, including an automatic backup from the last upgrade. No need to delete them.

    (If you only want a single automatic daily backup, you can change the backup.numBackups hidden pref to 1.)
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