I found the solution for error message "Authentication Failed. Please check your Key." for my DNS-320L firmware v1.08.
The problem is linked to the account name already stored, to resolve adding number after account, for example.
A workaround can be added a number after the email address of the account for example.
But the final solution in to remove the account name already stored.
Enable SSH e connect.
View file in /mnt/HD_a4/.systemfile/sched_gdrive, by use cat comand.
cd /mnt/HD_a4/.systemfile/sched_gdrive
cat account_list
cat sched_gdrive.xml
If the "account_list" file if it contains the "hidden" account names not present in "sched_gdrive.xml" this are not listed on the web page, these e-mail account can not be added and they return an authentication error.
"account_list" and "sched_gdrive.xml" must contain the same accounts for no problems.
I have in "account_list" a e-mail account not present in web page list.
I delete all account in web page.
I rename "account_list" in "_account_list_1".
Reboot the NAS.
Recreate the accounts.
I think there is possible solve without delete all account, but may be able to modify "account_list" via SSH.
Or by using PC share to PC the file modify and substitute.
I suggest to reboot NAS after substitute the file.
Hi