Hello @malgaze
Thank you for reaching out on the community and telling us about your issue. I do apologize for the issue you're having. I'm wondering if it thinks the connection may not be authenticated. Lets try seeing if we're able to fix the issue you're having by deactivating and reactivating the account. I'll leave steps down below.
First thing I'll recommend is to save a backup to revert back to just in case. You can find how to do so down below.
https://www.quicken.com/support/how-backup-or-restore-your-quicken-data
Next we'll try deactivating all of the accounts. You can do so by following the article listed down below.
https://www.quicken.com/support/deactivate-online-banking-services-quicken-account
Once all the accounts are deactivated go ahead and follow the article here on reconnecting the accounts.
https://www.quicken.com/support/reactivating-deactivated-account
Once you get the chance to try this let us know how it goes. If you're still having issues we'll take another look.
Thanks,
Quicken Francisco